单项选择题

21()

A．which
B．that
C．all
D．those

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单项选择题
It is the third time that I ______ here.
A．was
B．am
C．have been
D．had been
单项选择题
Some of his suggestions had been rejected ______ they were not practicable.
A．as
B．when
C．until
D．if
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