题目内容
7._________not clearly known how many animal species are in the danger of dying out.( )A. | They are | B. | What is | C. | There is | D. | It is |
分析 不清楚有多少动物物种正面临灭绝的危险.
解答 答案:D.根据真正主语how many animal species are in the danger of dying out可见空白处应为形式主语,纵观选项,唯有it可担当形式主语,故选D.注意区分主语从句B选项what…is 从句,就对了.
点评 本题考查it 形式主语,结合语义的基础上便能选出正确答案,同时要注意与主语从句不要混淆.
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