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
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单项选择题
This is the place ______ I used to camp when I was younger.
A．what
B．when
C．where
D．which
单项选择题
The teacher should explain the lesson, ______
A．shouldn't he
B．should he
C．doesn't he
D．does he
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