单项选择题

Mr. Jones, ______ life was once very hard, is now very successful in his business.

A．of him
B．his
C．whose
D．by whom
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单项选择题
We didn't finish the work in time. You ______ us since you were there.
A．might help
B．should help
C．could have helped
D．must have helped
单项选择题
______ is often the case, one third of the workers have over-fulfilled the production plan.
A．What
B．This
C．That
D．As
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