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

When I was your age, I dared to go out alone at night,() I

A.dare
B.didn't
C.did
D.dared

单项选择题

You()him ont though you were very busy.

A.should have helped
B.must help
C.ought to help
D.could have helped

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