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She will not be able to go with us because she a meeting. [ ] A. will have been

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She will not be able to go with us because she a meeting. [ ] A. will have been

She will not be able to go with us because she ________ a meeting.

[]A.

will have been

B.

must have

C.

has

D.

has to have

试题答案

答案:D

解析:

客观上必须做……用have to do…。