单项选择题

These countries were once worried that they would not have ______ supplies of petroleum.

A．proficient
B．efficient
C．potential
D．sufficient
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单项选择题
In the Chinese household, grandparents and other relatives play ______ roles in raising children.
A．incapable
B．indispensable
C．insensible
D．infinite
单项选择题
There was a big hole in the road which ______ the traffic.
A．set back
B．stood back
C．held up
D．kept down
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