We had already read the _____ before we operated the machine.

A. introduction
B. direction
C. explanation
D. instructions
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科目:高中英語(yǔ) 來(lái)源:浙江省期中題 題型:單選題

We had already read the _____ before we operated the machine.
[     ]
A. introduction
B. direction
C. explanation
D. instructions

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