单项选择题

The professor requests that we（）the term papers by the end of this month.

A．will hand in
B．will have handed in
C．to hand in
D．hand in

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单项选择题
The DNA test, together with other tests, the prisoner's innocence（）

A．proves
B．prove
C．proving
D．have proved
单项选择题
I'll tell you the secret, but（）you don't tell anyone else about it.

A．only if
B．if only
C．even if
D．if not
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