单项选择题

John ______ be could improve his exam results, but he did not have enough time to study.

A．knows how
B．knows that
C．knew how
D．knew that
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单项选择题
There is a computer system ______ the company is experiencing problems.
A．with which
B．as which
C．such as
D．for such
单项选择题
They talked and talked as if they ______ never meet again.
A．will
B．would
C．should
D．shall
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