问题
选择题
It ________ have been her to leave her child alone and do whatever she wanted. She isn't such a person.
A．couldn't
B．mustn't
C．mightn't
D．wouldn't
答案
答案：A
考查情态动词。根据语意可知，此处表示对过去情况的否定推测，表示“不可能”，故选A。
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