单项选择题

He failed the exam, () proved that he hadn't been working hard enough.

A.that
B.which
C.what
D.of which

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单项选择题

I () writing the article by the time you get back.

A.shall finish
B.must have finished
C.have finished
D.shall have finished

单项选择题

There are () students playing basketball in the room.

A.score of
B.scores of
C.two scores
D.two score of

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