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题目
.She had just finished her homework _________her mother asked her to practice playing the piano yesterday.
A.when B.while C.after D.since
感觉AB都可以,

提问时间:2020-07-26

答案
答案只可以是A,因为while后面应跟着一个持续的动作,多以进行式时态语标示.不要被playing一字混淆了,asked才是此谓句的动词.
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