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
You should ask ______ your parent's opinions about this matter.
A．after
B．to
C．with
D．of
单项选择题
I'd rather you (have gone) by train, because I (can't bear) the idea of (your being) in an airplane in (such) bad weather.
A．have gone
B．can't bear
C．your being
D．such
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