问题: _______finished his homework than the boy was asked to play the piano.
the right answer is :no sooner had he
i choose:no sooner has he
why use had
解答:
ｔｈａｎ从句里的事情发生在过去，而ｆｉｎｉｓｈ他的ｈｏｍｅｗｏｒｋ发生在这个过去的过去，所有是ｈａｄ
FYI
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