单项选择题

He_____ have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside.

A．should
B．must
C．wouldn’t
D．can’t
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单项选择题
One of the best ways for people to keep fit is to（）healthy eating habits:

A．grow
B．develop
C．increase
D．raise
单项选择题
It is reported that the police will soon look（）the case of the two missing children.

A．upon
B．after
C．into
D．out
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