单项选择题

_________ has already been pointed out before, English grammar is not a set of dead rules.

A．This
B．That
C．It
D．As
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单项选择题
________ you do, you should put your heart into it.
A．No matter how
B．Whenever
C．No matter what
D．Wherever
单项选择题
Last month, part of Southeast Asia was struck by floods, ________ effects can still be felt now.
A．which
B．whose
C．what
D．that
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