单项选择题

The word "poem" is concrete; ______ "poetry" is abstract.

A．when
B．as
C．while
D．since
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单项选择题
Whatever you say, I don't believe he would be ______ refuse to help me.
A．selfish enough
B．enough selfish to
C．as selfish as to
D．so selfish as to
单项选择题
It is useless ______ about this point now.
A．arguing
B．to argue about
C．to be argued
D．to argue
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