单项选择题

That matter is so confidential that it must not be discussed outside the office.

A．impressive
B．comprehensible
C．secret
D．indispensable
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单项选择题
He seemed reluctant to help us.
A．glad
B．tired
C．unwilling
D．pleased
单项选择题
Do you think this ring is real gold It's only worthless brass.
A．priceless
B．valueless
C．valuable
D．invaluable
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