单项选择题

--Must I turn off the light when I leave
--NO,________

A．you mustn’t
B．you can’t
C．you needn’t
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单项选择题
The foreign friends think ________ the Chinese people are very friendly.
A．that
B．if
C．because
单项选择题
Please speak louder ________ we can hear more clearly.
A．so that
B．since
C．when
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