单项选择题

So far every means ______ tried, but we still haven't found anything helpful to the case.

A．has been
B．are
C．is
D．have been
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单项选择题
If you like, you may ______ the sweater before buying it.

A．try out
B．put on
C．try on
D．wear
单项选择题
______ the opportunity, he might have become an outstanding musician.
A．To give
B．Given
C．Giving
D．To be given
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