单项选择题

I'm sorry, I forgot ______ the letter yesterday afternoon.

A．posts
B．post
C．posting
D．to post
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单项选择题
The teacher praised him for ______ he had
A．the progress; made
B．the progresses; made
C．a progress; taken
D．progress; taken
单项选择题
Please think it ______ ,you'll find a good way.
A．of
B．about
C．over
D．out
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