单项选择题

Very few scientists ________ with completely new answers to the world's problems.

A．come to
B．come round
C．come on
D．come up
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单项选择题
Hotel rooms must be ________ by noon, but luggage may be left with the porter.
A．departed
B．abandoned
C．vacated
D．displaced
单项选择题
The main road through Littlebury was blocked for three hours today after an accident ________two lorries.
A．involving
B．including
C．combining
D．containing
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