单项选择题

The two students ______ for two hours, I wonder what they are talking about.

A．talks
B．are talking
C．talked
D．have been talking
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They talked as if they ______ good friends for years.
A．are
B．were
C．had been
D．have been
单项选择题
They failed in the match ______ carelessness.
A．with
B．of
C．by
D．through
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