Miss Anne had a weak heart. She _____ a heart attack.
A、
should have
B、
should have had
C、
must have
D、
must have had
【正确答案】
D
【答案解析】
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 havedone能表达这样的意思。should have done意为“本该……”。
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