单项选择题

This test is rather difficult,______it is not beyond the reach of the students.

A．/
B．so
C．for
D．but
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单项选择题
People in the houser arc in danger now. We should do what we can______them.
A．to helping
B．to help
C．help
D．helping
单项选择题
I will go home for a holiday as soon as I______my exam.
A．am finished
B．had finished
C．finished
D．finish
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