单项选择题

He has made another discovery, ______ of great importance to science.

A．which I think it is
B．of which I think it is
C．which I think is
D．I think which is
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—Wily don't you take a shower—Didn't I just have
A．it
B．that
C．one
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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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