Mary__her homework last night but she can't find it now Adoes finish B.did finish C did finished

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Mary__herhomeworklastnightbutshecan''tfinditnowAdoesfinishB.didfinishCdidfinishedMary__herhomeworklas

Mary__her homework last night but she can't find it now Adoes finish B.did finish C did finished
Mary__her homework last night but she can't find it now Adoes finish B.did finish C did finished

Mary__her homework last night but she can't find it now Adoes finish B.did finish C did finished
选择C.
did是强调用法,句子是一般过去时,finish要用过去式.

B did finish
did 表强调
玛丽昨晚的确是做完作业了,但是现在却找不到

B
did用在肯定句中表示“确实,的确”的意思,因为助动词后要用动词原形,所以选B

选b
遵循一次变形原则 前面助动词已变形为过去 后面就不可在变了 用原型。

B强调