The new machine, if used _____, can hold up at least 10 years.

A. straight
B. correct
C. properly
D. fluently
C
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科目:高中英語(yǔ) 來(lái)源:0107 期中題 題型:單選題

The new machine, if used _____, can hold up at least 10 years.
[     ]
A. straight
B. correct
C. properly
D. fluently

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