单项选择题

I wonder why Jenny______ us recently. We should have heard from her by now.

A．hasn't written
B．doesn't write
C．won't write
D．hadn't written
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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
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
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