Miss Anne had a weak heart. She _____ a heart attack.A、should haveB、should have

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问题 Miss Anne had a weak heart. She _____ a heart attack.

选项 A、should have
B、should have had
C、must have
D、must have had

答案 D

解析考查情态动词的用法。根据句意，应填入对过去发生的事有相当把握猜测的词，这里只有must have done能表达这样的意思。should have done意为“本该……”。

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