语法与词汇
1.
11._____caused the accident has not yet been found.
A、
Which
B、
Whichever
C、
What
D、
Whatever
【正确答案】
D
【答案解析】
名词性分句。首先，谓语动词之前多为主语从句；其次，此主语从句中所缺的成分是主语，名词性质，故排除限定词性质的A和B。what和whatever区别在于前者确定特指，后者非确定特指，比较：What caused the accident was a broken bottle．
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