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
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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
单项选择题
Stephen Bullon is the only man in the village ______ today that has survived the war.
A．live
B．lived
C．alive
D．active
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