单项选择题

I'm sorry ______ answered your letter earlier.

A．having not
B．not having
C．not to have
D．to not have
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单项选择题
The students wish the summer vacation ______ now.
A．begins
B．has begun
C．began
D．had begun
单项选择题
Susan wants to know whether the measures have been agreed ______
A．to
B．with
C．over
D．upon
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