题目内容
20._______ there are living creatures in the outer space as those on Earth hasn't been proved until now.( )A. | How | B. | When | C. | Where | D. | Whether |
分析 在外太空是否有和地球上一样的生物存在到目前还未得到证实.
解答 答案:D.根据hasn't been proved until now说明前面整句是主语从句,而主语从句 there are living creatures in the outer space as those on Earth 可知句子完整,不缺成分,排除ABC,再根据句意,是否有和地球上一样的生物存在,故选D.whether是否
点评 本题考查主语从句的连接词,在充分分析句型基础上以及熟知whether词义的情况下便能选出正确答案.
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