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
______, some famous scientists have the qualities of being both careful and careless.
A．Strangely enough
B．Enough strangely
C．Strange enough
D．Enough strange
单项选择题
Be careful when you cross this very busy street. If not, you may get ______ by a car.
A．run out
B．run over
C．run away
D．run after
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