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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单项选择题
The thief ______ the lock of the lady's jewelry case open.
A．hit
B．forced
C．stoic
D．broke
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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