单项选择题

Oxygen is one of the elements ______ water consists.

A．of which
B．of that
C．by which
D．that
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单项选择题
The advisers propose that the plan ______ postponed for a few weeks.
A．been
B．to be
C．be
D．being
单项选择题
They should have gone earlier, ______
A. have they
B. didn’t they
G. haven’t they
D. shouldn’t they
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