单项选择题

Thomas would have been more successful if he had studied harder, ______.

A．didn't he
B．wouldn't he
C．hadn't he
D．hasn't he
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Some scholars have come ______ a new solution to the problem of population control.
A．up
B．up with
C．down
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单项选择题
Our investigation ______ the inefficiency of your management.
A．showed out
B．showed through
C．showed off
D．showed up
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