单项选择题

Having finished their morning work, the clerks stood up behind their desks, ______ themselves.

A．expanding
B．stretching
C．prolonging
D．extending
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单项选择题
The European Union countries were once worried that they would not have ______ supplies of petroleum.
A．proficient
B．efficient
C．potential
D．sufficient
单项选择题
Even when textbooks are ______ through a school system, methods of teaching may vary greatly.
A．commonplace
B．standardized
C．competitive
D．generalized
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