单项选择题

Old people ______ carefully.

A．must be listened
B．must be listened to
C．must listen to
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单项选择题
—Don't forget to lock the door.— ______.
A．No, I won't.
B．Yes, I won't
C．No, I will
单项选择题
Now let's stop talking and begin
A．write
B．written
C．to write
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