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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单项选择题
It rained hard yesterday,______ prevented me from going to the park.
A．that
B．which
C．as
D．it
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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