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
She didn't want to buy it, ______.
A．however good was it
B．however good it was
C．for how good might it be
D．for how good it might be
单项选择题
The first two problems are very difficult, but the rest ______ easy.
A．is
B．are
C．has
D．have
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