单项选择题

Britain has recently had a high level of unemployment-and the same is true ______ many other countries.

A．at
B．from
C．of
D．to
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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
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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