現在同學們應該搞清楚了吧。下面請再看一道考題：

She brought with her three friends, none of ________ I had ever met before.

A. them                    B. who                     C. whom                  D. these

這道題是用them還是whom？套用上面的分析，我們可以很容易地確定答案為C，而不是A。但是，如果我們把題目稍為改變一下呢？如改成：

She brought with her three friends, and none of ________ I had ever met before.

A. them                    B. who                     C. whom                  D. these

這道題的答案就不能是whom，而應是them了。當然，選these在語法上也是對的，只是意思上不是很通順，相比較而言，顯然不如用them好。

最后再來看一個很典型的例子：

Simon loves you, ________ is why he wants to be with you.

A. it                         B. that                      C. which                  D. what

由于that’s why…是同學們非常熟悉的句式，所以許多人可能會毫不猶豫地選B。又錯了！最佳答案應是C。首先，由于句子間沒有并列連詞，所以排除A和B；又因為what不是關系代詞，不能引導定語從句，所以也不能選。注意，如果在兩個句子間加上并列連詞and，或將其中的逗號改為破折號或分號，則可用that，如以下三句都是正確的：

Simon loves you—that’s why he wants to be with you.

Simon loves you and that’s why he wants to be with you.

Simon loves you; that’s why he wants to be with you.

【小練一下】

01. That bar on Milton Street, ______ by the way is very nice, is owned by Trevor’s brother.

A. that                      B. how                     C. which                  D. what

02. She says it’s Charlotte’s fault, ______ is rubbish, and that she blames her.

A. that                      B. how                     C. which                  D. what

03. Anyway, that evening, ______ I’ll tell you more about later, I ended up staying at Rachel’s place.

A. that                      B. how                     C. which                  D. what

04. Dust particles must have got into the motor, ______ is why it isn’t working properly.

A. it                         B. that                      C. which                  D. what

05. I’m afraid he’s more of a talker than a doer, ______ is why he never finishes anything.

A. it                         B. that                      C. which                  D. what

06. He asked a lot of questions, none of ______ was easy to answer.

A. which                  B. them                    C. what                    D. that

07. He told me that he had two girl-friends, neither of ______ knew anything about the other.

A. whom                  B. them                    C. which                  D. who

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