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

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单项选择题

We'd like to （）a table for five for dinner this evening.

A．preserve
B．retain
C．reserve
D．sustain

单项选择题

There has been a great increase in retail sales, （）

A．does there
B．isn't there
C．hasn't there
D．isn't it

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