单项选择题

A number of people ______ coming this way.

A． are
B． is
C． be
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单项选择题
Be quiet! Someone ______ the piano in the next room.
A． is playing
B． played
C． plays
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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