单项选择题

The weather forecast says it is going to clear ______ soon.

A．up
B．out
C．over
D．about
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单项选择题
Those experiments have laid a solid foundation for his ______ research in material science.
A．far
B．deep
C．farther
D．further
单项选择题
As she entered the room she could see big bright lights hung from the ______.
A．roof
B．top
C．ceiling
D．height
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