请教一个关于逗号的问题~~

Mayanist

正确答案应该是C: and therefore the most elusive 与the quietest并列修饰submarine.

思故

从逻辑上看，这样的分析不够清楚。我认为前半句是递进关系，即便强硬用选项A加逗号，改为and连接两个完整句的并列关系，后半句的“it”的指代也只能是主语the enemy’s new ship，并不含糊。

正确选项是C

Mayanist

没有递进关系, 后者只是对前者的一个补充说明,完全可以省略. 从物理意义上, 对于submarine而言，the quietest 与the most elusive是因果关系。

eva808

以下是引用Mayanist在2007-2-12 4:24:00的发言：

大全169
1.    Because the enemy’s new ship is the quietest and it is therefore the most elusive submarine, it is being increasingly viewed by the military as a threat to security.

(A) and it is therefore the most elusive submarine, it is being increasingly viewed

(B) it is therefore the most elusive of submarines, and it has increased the view

(C) and therefore the most elusive submarine, it is being increasingly viewed

(D) and therefore it is the most elusive of submarines, there is an increasing view（C）

(E) therefore being the most elusive of submarines, it is increasingly viewed

大全的解释说A不对的原因是and前面缺少逗号

我觉得是否可以认为在A的情况下，and it is therefore the most elusive submarine, 应该作为插入语，否则it is being increasingly viewed by the military as a threat to security. 显得不舒服，特别的是it的指代不清晰。加上逗号之后表示插入部分可被省略，这样it可清晰地指代 the enemy’s new ship.

插入语是不是可以为一个完整的句子呢~~不懂

Mayanist

插入语是不是可以为一个完整的句子呢~~不懂
==>插入部分可以是完整句子 -- 插入句。

这个题目中A选项的关键问题是：如果没有逗号，前面两个部分构成一个完整/独立的句子；第三部分就变成了run-on sentence.

有关run-on sentence，请参见，http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=227128&page=1

Mayanist

    

http://www.grammar-monster.com/lessons/parenthesis_lessons.htm

    

Parenthesis插入语

    

Parenthesis
can be shown using two brackets, two commas or two dashes - the choice is
yours.

    

A parenthesis adds more
information to a sentence. For example:

    

Kent
Oliver won his first race on Tuesday.  (no parenthesis in this example)

    

Kent
Oliver - the only professional jockey from Jersey
– won his first race on Tuesday.

    

(The
words "the only professional jockey from Jersey"
add more information.)

    

 

    

1. A parenthesis is separated
from the rest of the sentence by commas, dashes or brackets (all called
parentheses).  When a parenthesis is completely removed, the sentence is
still grammatically correct. Examples (parenthesis in bold):

    

Jamie
Buxton, who fainted in church during his
wedding, apologized to his wife by booking two tickets to New York.

            

            

    

At Midnight last night, Skip (a
guard dog for Bonds Ltd in Bury) hospitalized two burglars before
returning to eat the steaks they had thrown him.  

            

            

    

Dave
Jenkins' best friend, Adam Wright-Smith,
stabbed him through the heart whilst testing a knife-proof jacket; Dave is
expected to make a full recovery.  

    

 

            2. Additional comments such as "however",
"therefore", "as a result", "as far as I am
concerned", "for all intents and purposes",
"subsequently", "so to speak", etc. fall into the category
of parenthesis too.  (As a rule, brackets are not used with these.)

    

Examples:

    

The
slow cooker I purchased at your store is, for all intents and purposes, utterly
useless.

    

Darius,
on the other hand, writes his own songs.

    

It
rained all day and, as a result, the hut collapsed.

    

On a
happier note, her latest song - Wind Me
Up Baby - is, according to those in
the know, expected to enter the charts in the top 5.

    

  

    

HELP - WHICH ONE? 

    

It
is your choice whether to use commas, brackets or dashes for parentheses. 

    

Dashes
- parenthesis easily seen, but dashes look a little stark

    

Commas
- normal looking sentence, but commas are often confused with other commas in
the sentence

    

Brackets
- parenthesis easily seen, but brackets make official letters look a little
unorganised 

    

 

    

END THE PARENTHESIS

    

Always
remember to end a parenthesis. When using commas or dashes, writers often
forget to end the parenthesis. This is as wrong as not closing a pair of
brackets.

    

Danny,
however had sharp features and greasy hair.  (another comma required after
"however") 

    

 

    

PARENTHESIS IN APPOSITION 

    

The
term "in apposition" just means "the same".  When a
parenthesis is the same thing as whatever it follows, it is called
"parenthesis in apposition".

    

Kent
Oliver - the only professional jockey from Jersey
- won his first race on Tuesday. (Kent Oliver is the professional jockey.
This is parenthesis in apposition.)

    At midnight last night, Skip (a guard dog for Bonds Ltd in Bury) hospitalised two
intruders who broke in the company yard. (Skip is the guard dog. This is
parenthesis in apposition.)