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初中英语---David promised to come round to have supper with us t

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初中英语
---David promised to come round to have supper with us today.
---But he ______.I have been alone for half an hour.
A. won't
B. hadn't
C. hasn't
D. doesn't
详细解释
初中英语---David promised to come round to have supper with us t
第一句表示 大卫承诺说要过来跟我们一起吃晚餐
从第二句的but以及后面I have been alone for half an hour可以知道大卫到目前为止是没有出现的.而且I have been alone for half an hour用的是现在完成时,表示到现在为止,我已经一个人待了半个小时.
A 表示将来时,明显不符
B 过去完成时,跟后面的现在完成时不符
D 表示一般现在时,明显不符
C 跟后面的完成时一致,且完成时表示他的缺席给我带来了影响,即让我等待了半小时
综上所诉,选择C
(够详细了吧?
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