单项选择题

It's really nice ______ you ______ help me ______ my biology.

A． of; to; with
B． for; to; in
C． of; for; on
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单项选择题
But it's ______ important meeting, we can't miss it.
A． a such
B． such
C． such an
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The PRC ______ on October 1st, 1949.
A． was found
B． founded
C． was founded
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