It have been her to leave her child alone and do whatever she wanted. She isn't such a pe

问题补充：

It have been her to leave her child alone and do whatever she wanted. She isn such a person.

A. couldn

B. mustn

C. mightn

D. wouldn

答案：

(答案→)A. couldn

B. mustn

C. mightn

D. wouldn

解析：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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