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
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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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