Mr. Liu ____ come to the party, but perhaps he will go to see his father.

A. must
B. should
C. may
D. ought to
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科目：高中英語 來源：期末題 題型：單選題

Mr. Liu ____ come to the party, but perhaps he will go to see his father.
[     ]
A. must
B. should
C. may
D. ought to

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