单项选择题

The work they are doing is ______ great value.

A．in
B．of
C．by
D．from
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单项选择题
I regret ______ the novel to Jim because he made it very dirty.
A．to lend
B．having lent
C．to be lending
D．lent
单项选择题
Kevin is the only student in the class ______ failed in the exam.
A．who
B．that
C．which
D．whom
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