单项选择题

In winter, animals have a hard time________ anything to eat.

A．to find
B．to finding
C．to find out
D．finding
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单项选择题
You ought________ the matter to the manager the day before yesterday.
A．to report
B．to have reported
C．to reporting
D．have reported
单项选择题
The doctor will not perform the operation_________ it is absolutely necessary.
A．so
B．if
C．for
D．unless
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