单项选择题

I still remember the days ______ we spent together abroad.

A．why
B．when
C．which
D．where
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单项选择题
I'm sorry, I forgot ______ the letter yesterday afternoon.
A．posts
B．post
C．posting
D．to post
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
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