It"s important ______ the piano well. [ ]A. of him to play

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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

I found           interesting to write e-mail English.       [     ]
A. its
B. it
C. this
D. that

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Tom finds __________ difficult to remember these strange English words.[ ]
A. that
B. this
C. it
D. one

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______some ads can be very useful.        [     ]
A.  Its true
B.  That"s true
C.  It"s true that
D.  This is true

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He found         _  very interesting to have a picnic in the open air.       [     ]
A. it"s
B. it
C. that
D. this

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Tom, _____ your job to wash the dishes. [     ]
A. this is
B. that is
C. it is
D. he is

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