单项选择题
Why do you have to carry that ______
A.piece of luggage
B.luggage
C.luggages
D.of luggages
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单项选择题
This is a lovely ______.
A.piece music
B.piece musics
C.music
D.piece of music
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单项选择题
______ to tell us everything, we could try to solve his problem.
A.If he is
B.Had he
C.Were he
D.Be he
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