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
______ is not yet decided ______ we are to have the meeting.
A．It; where
B．That; where
C．Which; that
D．What; that
单项选择题
There are some differences between the two. I really don't know ______.
A．where to choose
B．which to choose
C．to choose what
D．to choose which
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