单项选择题

Nothing is available here, ______

A．is it
B．isn't it
C．is nothing
D．isn't anything
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单项选择题
As to himself, he regarded it ______ of very little value.
A．of
B．as
C．over
D．with
单项选择题
______ is not known yet.
A．If this method is better
B．Whether this method is better
C．If this method is better or not
D．Whether this method better
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