单项选择题

No sooner had the train started()Mrs. Smith said that she had forgotten her bag.

A．when
B．than
C．then
D．that

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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
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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