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
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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
Pick me up at 8 o'clock. I ______ my bath by then.
A．may have
B．will be having
C．can have had
D．will have had
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