It"s important _____the piano well. [ ]A. of him to play B. for

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It"s important _____the piano well.    [     ]
A. of him to play
B. for him to play
C. of him playing
D. for him playing

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举一反三

My brother often makes mistakes      grammar.   [     ]
A. in
B. of
C. by
D. at

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I passed the English exam        the help of my friend.       [     ]
A. by
B. with
C. in
D. at

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-What was she angry      ?
-The broken glass.         [     ]
A. with
B. to
C. about
D. over

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Jim is good at basketball. He is           the city basketball team.    [     ]
A. at
B. on
C. of
D. with

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Please turn off your TV. You can"t leave the room _____ the TV _____.[ ]
A. when; on
B. with; on
C:. with; off
D. when; off

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