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
单项选择题
As soon as you ______ I'll tell you the news.
A． are coming
B． will come
C． come
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