单项选择题
Be quiet! Someone ______ the piano in the next room.
A． is playing
B． played
C． plays
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单项选择题
Air cannot ______,but it is all around us.
A． is seen
B． see
C． be seen
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单项选择题
Can you tell me ______
A． she is whose girl
B． whose is the girl
C． whose girl she is
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A． or B． and C． but
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A． to B． for C． with
A． at B． on C． for
A． terrible B． bad C． wonderful