单项选择题

Environmental protection（）everyone's support.

A．calls for
B．calls forth
C．calls off
D．calls up

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单项选择题

I have worked very hard for the exam, but the result doesn't quite（）.

A．find out
B．give out
C．hand out
D．work out

单项选择题

It was John（）changed her mind so soon.

A．why
B．how
C．that
D．when

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