单项选择题

The company is going to hand ______ the free samples tomorrow.

A．up
B．out
C．on
D．down
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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
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
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