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
Because of many mistakes, she was made_________ these letters again.
A．type
B．to typing
C．typed
D．to type
单项选择题
——_________does Mr. Johnson go to London on business ——At least once a month.
A．How many
B．How long
C．How often
D．How
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