单项选择题

The neighborhood boys like to play basketball on that ______ lot.

A．valid
B．vain
C．vacant
D．vague
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单项选择题
We ______ our breakfast when an old man came to the door.
A．just have had
B．have just had
C．just had
D．had just had
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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