单项选择题

If I see the twin brothers apart I don't know______.

A．who is who
B．who is whom
C．which is which
D．what is what
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单项选择题
Although ______ Chinese, Bush attended the course.
A．was knowing
B．he is knowing
C．having a knowledge of
D．knows
单项选择题
If you want to make money, buy cheap and sell______.
A．high
B．dear
C．expensive
D．deep
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