单项选择题

Clothing made of plastic fibers has certain advantages over ______ made of natural fibers like cotton, wool, or silk.

A．one
B．the one
C．that
D．what
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单项选择题
It is obviously necessary that both the President and his advisers ______ down to earth.
A．will be
B．should be
C．would be
D．must be
单项选择题
All the investigations ______ before the deadline, the staff decided to have a party as a celebration.
A．been fulfilled
B．had been fulfilled
C．were fulfilled
D．having been fulfilled
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