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
We should make mental preparation for failure, because there is only a(n)______number of possibilities of success.
A．infinite
B．finite
C．innumerable
D．numerous
单项选择题
Doing your homework is a sure way to improve your test scores, and this is especially true ______it comes to classroom tests.
A．when
B．since
C．before
D．after
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