限制性定语从句还是非限制性定语从句

限制性定语从句还是非限制性定语从句

下面这道题是考查限制性定语从句还是非限制性定语从句?

If a book is in English, __________ may mean slow progress for you.

A. that                        B. which                        C. as                        D. and it

此题应选 A。容易误选 B。许多考生一看到空格前的逗号，就想当然地认为这是非限制性定语从句，从而误选了B。

考生可以想一想，假若此题选B(which)，which 用以引导一个非限制性定语从句，而其前又是一个以if 引导的条件状语从句，那么请问：此句的主句在哪里?

通过以上分析我们可以知道，既然本句前面有一个条件状语从句，那么后面一句就应该是主句。本题选that, 即为主句主语，全句意为：如果一本书是用英语写的，那么那就意味着你要读得慢些。

注意：当从句位于主句之前时，千万不要在主句前误加并列连词或误认为是某种从句。请做以下单选题。如：

1. When he was tired, ________ he had a rest.

A. and                         B. but                     C. so                           D. ×

2. Because he got up too late, ________ he missed the train.

A. so                           B. but                      C. and                        D. ×

3. Though he is poor, ________ he is happy.

A. and                         B. so                       C. but                         D. ×

5. As is known to us all, ________ China was liberated in 1949.

A. and                         B. but                      C. which                    D. ×

答案：1. D 2. D 3. D 4. D 5. D