单项选择题

It is important for everyone ______ learn English.

A．by
B．when
C．to
D．how
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单项选择题
As a father I ______ the mess my children make every evening.
A．used to clean up
B．am used to cleaning up
C．had to clean up
D．willing to clean up
单项选择题
Have you finished ______ the letter to your mother
A．written
B．write
C．wrote
D．writing
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