All assembly line workers must be ______in the use of fire extinguishers and the basic fire drills.

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问题 All assembly line workers must be ______in the use of fire extinguishers and the basic fire drills.

选项 A、taken
B、understood
C、trained
D、revealed

答案C

解析词汇：动词1．这是一道词汇题，选项均为动词。2．原文意思是“所有的流水线工人都要接受培训”，因此(C)trained为正确选项。

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