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
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单项选择题
While shopping, people sometimes can't help ______ into buying something they don't really need.
A．to persuade
B．persuading
C．being persuaded
D．be persuaded
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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