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
If you want children to work hard you must ______ their interests instead of their sense of duty.
A．call back
B．appeal to
C．give rise to
D．go in for
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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