单项选择题

If I knew the answer, I wouldn't be asking, ______

A．didn't I
B．did I
C．would I
D．wouldn't I
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单项选择题
______ the poem a second time, the meaning will become clearer to you.
A．Your having read
B．While reading
C．If reading
D．When you read
单项选择题
--The cars give off a great deal of waste gas in the streets. --Yes. But I'm sure something will be done to ______ air pollution.
A．reduce
B．remove
C．collect
D．warn
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