请教OG12-7，18,26的相关问题

crystalxin

OG12----7. As its sales of computer products have surpassed those of measuring instruments, the company has become increasingly willing to compete for the mass market sales they would in the past have conceded to rivals.

(A) they would in the past have conceded to rivals

(B) they would have conceded previously to their rivals

(C) that in the past would have been conceded previously to rivals

(D) it previously would have conceded to rivals in the past

(E) it would in the past have conceded to rivals

我想问的是 1，in the past是时间副词么？（注意词性）

（有贴说：副词要紧邻其修饰的对象，两种情况A) 不要把副词放在动词或其他成分前，而是要放在副词想限定修饰的成分前     B) 不要把副词与名词放在一起，而远离了其修饰的形容词等）那么这一题的in thepast是修饰动词have conceded么？
联想到OG12-21题：（下面这个句子已经是对的）

Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.
这里的 over thepastyears这个时间副词修饰的是动词么？（可是“不要把副词放在动词或其他成分前，而是要放在副词想限定修饰的成分前 ”是什么意思呢，不修饰动词，显然也不能修饰名词啊？）还有OG12--3的时间副词是哪一个？这个的用法能不能给我讲一下呢？

2，in the past 一般是和一般过去时连用还是现在完成时呢。因为以前见的总结是 如果 in  the past单独用是与一般过去式连用，如果in  the past后面接短时间（比如in the past5 years）就和现在完成时连用。可是在本题这个规则没有适用啊？
OG12---18

Plants are more efficient at acquiring carbon than are fungi, in the form of carbon dioxide, and converting it to energy-rich sugars.

(A) Plants are more efficient at acquiring carbon than are fungi,

(B) Plants are more efficient at acquiring carbon than fungi,

(C) Plants are more efficient than fungi at acquiring carbon,

(D) Plants, more efficient than fungi at acquiring carbon,

(E) Plants acquire carbon more efficiently than fungi,
我想问的是：这里的介词结构做什么成分？插入语么？（in the form of carbon dioxide ）还是修饰语？还有我一直不太明白修饰成分（专指有逗号的那一种）有哪些可以充当呢？： 非限制性定语从句，v-ing，v-ed（这个叫什么呢），同位语？还有介词结构么？


OG12--14

14. Sunspots, vortices of gas associated with strong electromagnetic activity, are visible as dark spots on the surface of the Sun but have never been sighted on the Sun’s poles or equator.

(A) are visible as dark spots on the surface of the Sun but have never been sighted on

(B) are visible as dark spots that never have been sighted on the surface of the Sun

(C) appear on the surface of the Sun as dark spots although never sighted at

(D) appear as dark spots on the surface of the Sun, although never having been sighted at

(E) appear as dark spots on the Sun’s surface, which have never been sighted on

这个C选项在OG中的解释（针对我话红线的部分）是not complete verb 是不是说 v-ed如果题目是有被动的意思选项中单独出现（没有用  be  v-ed）就是不完整的动词，如果v-ed作为一般过去是可以表示过的动作，就是完整的动词？
to do 在句尾可以向which跳跃指代么：S is essential  items of military equipment to protect warriors(OG12---30 E选项的修改版)这里的 to protect 指代的是military equipment？还是items？ (不考虑原句的考点只看现在这个句子的情景)

OG12---11

There are several ways to build solid walls using just mud or clay, but the most extensively

used method has been the forming of bricks out of mud or clay, and, after some preliminary air

drying or sun drying, they are laid in the wall in mud mortar.

(A) the forming of bricks out of mud or clay, and, after some preliminary air drying or sun drying, they are laid

(B) forming the mud or clay into bricks, and, after some preliminary air drying or sun drying, to lay them

(C) having bricks formed from mud or clay, and, after some preliminary air drying or sun drying, they were laid

(D) to form the mud or clay into bricks, and, after some preliminary air drying or sun drying, to lay them

(E) that bricks were formed from mud or clay, which, after some preliminary air drying or sun

drying, were laid

有贴说：the way to do sth is to do 这样的结构一定保留,很好的平行，请能不能帮我分析一下这里的 way  是不是主语？ 原题中 to do。。。后的是不是宾语ways  are to build solid walls using just mud or clay，but  the most extensively  has been to form the mud or clay into bricks, and, after some preliminary air drying or sun drying, to lay them（是不是 way be to do <平行连接词>way  be todo呢）因为这个题目我看不出是主系表平行？？==

13. A surge in new home sales and a drop in weekly unemployment claims suggest that the

economy might not be as weak as some analysts previously thought.

(A) claims suggest that the economy might not be as weak as some analysts previously thought

(B) claims suggests that the economy might not be so weak as some analysts have previously

thought

(C) claims suggest that the economy might not be as weak as have been previously thought by

some analysts

(D) claims, suggesting about the economy that it might not be so weak as previously thought by

some analysts

(E) claims, suggesting the economy might not be as weak as previously thought to be by some analysts

A:  as thought习惯性省略， （请问这里那里有省略？）
题目有点多，写的有点乱，希望大家多多指教！！！

crystalxin

肿么木有人？？