单项选择题

I intend to study English ______ American business methods.

A．to understand
B．understanding
C．understood
D．understand
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单项选择题
Seldom ______ her in the public.
A．you can see
B．can see you
C．can you see
D．you see
单项选择题
______ sex has its own physical and psychological characteristics．
A．Every
B．Each
C．Both
D．Neither
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