单项选择题

Having been served lunch, ______.

A．the problem was discussed by the committee
B．the committee discussed the problem
C．it was discussed by the committee the problem
D．a discussion of the problem was discussed
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单项选择题
Early forms of life on Earth, ______ in absence of oxygen, required other elements.
A．which lived
B．that lived
C．lived
D．were living
单项选择题
The woman ______ herself to doing scientific research.
A．took
B．assigned
C．arranged
D．committed
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