单项选择题

We ought to______ detailed investigations and studies before we draw any conclusions.

A．administrate
B．process
C．undertake
D．duplicate
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单项选择题
They are sure they have all the facts they need to ______the existence of a black hole.
A．obtain
B．maintain
C．verify
D．display
单项选择题
It's the company's conviction that its business will be expanded rapidly, though it is at a rather______ level now.
A．modest
B．mild
C．minor
D．minimum
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