-David promised to come round to have supper with us today．-But he ．I've been alone for half an hour．( )A．won'tB．hadn'tC．hasn'tD．doesn't 题目和参考答案——青夏教育精英家教网—

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18．-David promised to come round to have supper with us today．
-But he ____．I've been alone for half an hour．（　　）

A．

won't

B．

hadn't

C．

hasn't

D．

doesn't

分析 --David答应今天过来和我们一起吃晚餐．
--但是他还没来，我一个人呆了半个小时了．

解答答案：C．
根据语境I've been alone for half an hour"我一个人呆了半个小时了．"判断设空处的意思是"但是他还没来"强调"没来"这种状态延续到现在，所以用现在完成时．现在完成时的构成是：主语+have/has+动词的过去分词；主语是he，助动词用has，否定句为he hasn't，故答案为C．

点评本题考查了动词的时态．做题时，一定要特别关注有关的时间短语，这是判断句子时态的标志．在没有时间状语的情况下可以联系上下文根据语境来做出正确判断．

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