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
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单项选择题
The woman ______ herself to doing scientific research.
A．took
B．assigned
C．arranged
D．committed
单项选择题
He _______ the picture on the wall.
A．hanged
B．hung
C．has hanged
D．was hanged
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