单项选择题

______ you were coming today, I would have picked you up at the station.

A．Had I known
B．I have known
C．Have I known
D．I had known
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单项选择题
She is often heard ______ French aloud in the morning.
A．to read
B．read
C．to have read
D．to be reading
单项选择题
Judging from what he said, Jack seemed ______ everything already.
A．understand
B．to be understanding
C．understandable
D．to have understood
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