单项选择题

I wanted to pay for the coffee, but I found that all Ihad was a couple of（） coins.

A．worthless
B．priceless
C．invaluable
D．inexpensive

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单项选择题
The company isn’t（）doing such big business.

A．ableto
B．capable to
C．ableof
D．capable of
单项选择题
Many thousands have benefited （）the new medical system.

A．on
B．in
C．to
D．from
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