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19.-______nearly took us an hour to walk here.
-Have a drink,then.You ______ be thirsty.(  )
A.This;mayB.It;mayC.This;mustD.It;must

分析 -步行到这里花了我们将近一个小时的时间.-那就喝点东西吧.你们一定口渴了.

解答 答案:D  第一句中句型 It takes sb.some time to do something.意思是:做某事花费了某人…时间.to walk here是真正的主语,为了避免头重脚轻,通常在句首使用it做形式主语,而把真正的主语主语放在句子末尾. 第二个空,根据答语Have a drink,then.可以得知后面的肯定性推测:你们一定口渴了.情态动词表示推测时,may 或许,可能,语气不够肯定;must 一定,语气肯定.故选D.

点评 在英语中,当不定式、动名词、从句等用作主语主语时,为了避免头重脚轻,通常在句首使用it做形式主语形式主语it,而把真正的主语主语放在句子末尾.

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