单项选择题

______ caused the accident is still a complete mystery.

A.How
B.That
C.Where
D.What
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单项选择题
It's no use______with him. He won't change his decision.
A.arguing
B.to argue
C.to be arguing
D.if you argue
单项选择题
—The educational system rather than the teachers ______ to answer for the overburden on the students.—I agree. I hope the reform being carried out in our country at present will bring about the______results.
A.are, desired
B.is, desired
C.are, desiring
D.is, desiring
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