单项选择题

Jumping out of ______ airplane at ten thousand feet is quite ______exciting experience.

A．不填; the
B．不填; an
C．an; an
D．the; the
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单项选择题
Having a trip abroad is certainly good for the old couple, but it remains ______whether they will enjoy it.
A．to see
B．to be seen
C．seeing
D．seen
单项选择题
—Don't forget to come to my birthday party tomorrow.
A．I don't
B．I won't
C．I can't
D．I haven't
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