单项选择题

______ you were coming today, I"d have met you at the airport.

A．Have I known
B．I have known
C．Had I known
D．I had known
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单项选择题
______, I couldn t lift the box.
A．As I might try
B．As try I might
C．Try as I might
D．Try I might as
单项选择题
Only after entering the classroom, ______ that he made a mistake.
A．did he realize
B．he realized
C．he realizes
D．does he realize
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