单项选择题

We will not go to the party ______ we are politely invited.

A．if
B．however
C．whether
D．unless
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单项选择题
Can you ask your neighbors for help I'm afraid not. I ______ know any of them.
A．only
B．hardly
C．seldom
D．just
单项选择题
More than ten percent of the workers ______ from Italy.
A．is
B．comes
C．was
D．are
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