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
It is natural that one's attitude ______ his family changes as he grows older.
A．for
B．at
C．of
D．towards
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