Lucy ______ her homework this morning, but she didn’t.A、may be doingB、must have

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问题 Lucy ______ her homework this morning, but she didn’t.

选项 A、may be doing
B、must have done
C、should have done
D、can do

答案 C

解析考情态动词。may be doing表示对现在情况的推测，must have done表示对过去情况的肯定推测，should have done表示本该做某事，但实际没有做；can表示具备做某事的能力。句意为：Lucy今早本该做家庭作业，但是她没有做。故选C。

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[originaltext]W:Goodmorning.BritishAirways,whatcanIdoforyou?M:Good