单项选择题

It is difficult ______ a world record and even more difficult to ______ it.

A．keeping, set
B．keep, set
C．set, keep
D．to set, keep
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单项选择题
A decision must be ______ immediately ______ stop the factory ______ waste water with out being treated.
A．made, to, pouring
B．made, 不填, to pour
C．done, 不填, pouring
D．had , to, to pour
单项选择题
The used computer was sold for 3, 600 yuan, which was more than its real ______.
A．worth
B．price
C．value
D．cost
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