[求助]比较一下这两道题，可能会有点收获

大全885C-18.   The
owner of Steele’s Grocery in Osage, Ohio, saved $600 monthly on heat during the
winter by putting all his refrigerator air compressors together in an insulated
compartment, then installing two fans and a duct that carried waste heat
from the compressors into the main part of the store.D  注意，此处的then副词做连词用。

(A) then
installing two fans and a duct that carried

(B) then he
installing two fans and a duct that carried

(C) then two fans
were installed with a duct that carried

(E) installing two
fans, and a duct carrying

答案是A，我选的D，我的问题是D有什么问题，是不应该有AND吗，我记得XDF曾经说过n个元素并列时，n大于2，x1，x2，x3，andx4，是这个错误吗

再有一道大全885c-21

        After
Queen Isabella asked Admiral Columbus to describe the island of Hispaniola (now
Haiti), which was newly discovered, he had reached for a sheet of paper,
crumpled it, and said, “It looks like that—beyond the mountains, more
mountains.”C

(A) After Queen
Isabella asked Admiral Columbus to describe the island of Hispaniola (now
Haiti), which was newly discovered, he had reached

(B) On being asked
to describe the new discovery of the island of Hispaniola (now Haiti) by Queen
Isabella, Admiral Columbus, reaching

(C) Queen Isabella
asked Admiral Columbus to describe the newly discovered island of Hispaniola
(now Haiti), then he reached

(D) When asked by
Queen Isabella to describe the newly discovered island of Hispaniola (now
Haiti), Admiral Columbus reached（D）

(E) After Queen
Isabella had asked Admiral Columbus to describe the discovery of the island of
Hispaniola (now Haiti), he had reached

正确答案是D，我选了C，这道题我有如下几个问题

1.A和E中，是不是after。。。he  reached的时态有错误？

My view:

then沒有作為連接詞的功能，第一題為什麼要選A，是因為by後面接名詞片語

by putting.......,then installing......並不是子句，所以不需要連接詞

再者,D的邏輯不通,duct是用來把熱氣排掉的,不是人把熱氣排掉.

第二題：兩個句子要連接詞,then不能當連接詞所以當然不能選囉!

大全885C-18.   The
owner of Steele’s Grocery in Osage, Ohio, saved $600 monthly on heat during the
winter by putting all his refrigerator air compressors together in an insulated
compartment, then installing two fans and a duct that carried waste heat
from the compressors into the main part of the store.D  注意，此处的then副词做连词用。

(A) then (by) installing two fans and a duct that carried

(E) installing two fans, and a duct carrying

答案是A，我选的D，我的问题是D有什么问题，是不应该有AND吗，我记得XDF曾经说过n个元素并列时，n大于2，x1，x2，x3，andx4，是这个错误吗

D的致命错误在于它吧carry的主语错误地指向了owner of Steele’s Grocery , 即整个句子的主语, 犯了主谓搭配的错误, 是个逻辑错误, 句子的结构变成:

owner of Steele’s Grocery....by putting ...installing...and then carrying , 其实这两个动作前两个确实是人做的, 而第三个明显是duct才能做的, 所以是个逻辑上的大错

楼主的第二个问题实际上根本在于连词的选择:

这个似乎需要楼主更多的体会:

明显是when用在这里比after 要好.

另外不用then 是因为你可以看到你的第一个例子中,两个动作是一前一后的, 有连贯性的

而第二个例子中即使翻译成中文, 如果用then, 则成了queen问XXX, 而后XXXreached

其实较好的说法是说当queen问XXX, 他reached

这两个动作并非是连贯的, 即使是说一前一后也是用after在此处比then恰当