单项选择题

He is very helpful. What he did for us made the job much easy

A．done
B．doing
C．to do
D．being done
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单项选择题
He thought this painting of little ______ and let me have it for only 20 yuan.
A．price
B．worth
C．cost
D．value
单项选择题
They show no ______ in this topic.
A．any interest
B．interesting
C．interests
D．interest
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