—Who is the volunteer for Exp0 2010 Shanghai China? —I think it __

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—Who is the volunteer for Exp0 2010 Shanghai China?
—I think it __   __ your sister. Because she likes volunteering.               [     ]
A. can"t be
B. must be
C. wouldn"t be

答案

举一反三

The book         _ John"s.  There is his name on it.                [     ]
A. can be
B. can"t be
C. must be

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My little sister doesn"t like playing basketball.  So it         _ hers.              [     ]
A. can"t be
B. must be
C. mustn"t be

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—Look! The old man must be your father.
—No. He          _ my father. My father has gone to Beijing to take the 60th birthday celebration of
    our country.               [     ]
A. must be
B. must belong to
C. can"t be

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You _     _ worry about your mother.  She will be better soon.                [     ]
A. must
B. needn"t
C. have to

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—_     _ I go there on foot now?
—No, you _        .                [     ]
A. Can, can"t
B. Must, needn"t
C. Must, mustn"t

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