题目内容
12.It is still unclear _____ the man didn't speak the truth..( )A. | that | B. | how | C. | when | D. | why |
分析 仍然不清楚这个男人为什么不说出真相.
解答 答案:D.根据It is still unclear说明it 是形式主语,而真正主语 the man didn't speak the truth可知句子不完整,这个男人为什么不说出真相,缺原因状语,故选D.
点评 本题考查主语从句的连接词,在充分分析it 形式主语的基础上再结合语义便能选出正确答案,同时要注意与it is clear that句型不要混淆.

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