Question

It is reported that two schools, ______ are being built in my hometown, will open next year.

1. A.
   they both
2. B.
   which both
3. C.
   both of them
4. D.
   both of which

Answer 1

D
思路分析：根据句子结构分析可知，若在空格处填上A、C两项，则会出现句式混杂现象；B项说法不存在。故选D项来引导一个非限制性定语从句，既合语法又合句意。
点评：该题考查非限制性定语从句，难度偏难。解答定语从句类题目时，应从分析句子成分入手，根据从句所需来选择合适的引导词。