单项选择题

It is useless ______ about this point now.

A．arguing
B．to arguing
C．to be argued
D．to argue
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The word poem is concrete; ______ poetry is abstract.
A．when
B．as
C．while
D．since
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More than one student ______ file College English Test Band Six.
A．have passed
B．has passed
C．had passed
D．had been passed
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