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
The mother didn't know ______to blame for the broken glass as it happened while she was out.
A．who
B．when
C．how
D．what
单项选择题
Boris has brains. In fact, I doubt whether anyone in the class has ______IQ.
A．a high
B．a higher
C．the higher
D．the highest
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