单项选择题

Not that I'm unwilling to lend you a hand, __ I'm too busy for the moment.

A．because
B．but that
C．but
D．however
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单项选择题
______ he referred to in his speech, the pollution in Beijing is indeed not serious.
A．What
B．As
C．Which
D．Since
单项选择题
--Why don't you take a shower --Didn't I just have ______
A．it
B．that
C．one
D．this
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