单项选择题

Although he was ill, () he went on working.

A．but
B．yet
C．and
D．while

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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
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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