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来自范金保的问题

　　Iphonedyouat9:00thismorningbutgotnoanswer.lamsorry.l_____thebell.l____inthegarden.Ahaven'theard,musthavebeen.Bdidn'thaveheard,mustbeCdidn'thear,musthavebeenDdidn'thear,mustbe选哪个?为什么?

　　Iphonedyouat9:00thismorningbutgotnoanswer.

　　lamsorry.l_____thebell.l____inthegarden.

　　Ahaven'theard,musthavebeen.

　　Bdidn'thaveheard,mustbe

　　Cdidn'thear,musthavebeen

　　Ddidn'thear,mustbe

　　选哪个?为什么?

1回答

2020-05-3122:00

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施毅

　　选C

　　Iamsorry.Ididn'thearthebell(atthatmoment).Imusthavebeeninthegarden.

　　没有回复的原因是（当时）我没有听到铃声响.MUST表推测,用完成式表过去时间里发生的行为或动作.

2020-05-31 22:04:10

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