单项选择题

He studied hard at school when he was young, ______ contributes to his success in later life.

A．which
B．that
C．what
D．each of which
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单项选择题
Robert looked as if he were about to ______ when his motives were questioned.
A．flare up
B．jump up
C．burst up
D．look up
单项选择题
Say ______ what you mean and then there will be no misunderstanding.
A．casually
B．eventually
C．necessary
D．precisely
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