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
When and where to hold the meeting __________ not decided yet.
A．is
B．are
C．has
D．have
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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