You should read the in the car repair manual(手册)carefully before you start.A. instructions

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(答案→)A. instructions
B. instruction
C. introductions
D. explanations
解析：考查名词辨析。instructions说明用复数；introduction介绍 explanation 解释. 本句意思是：你应该在开始之前仔细阅读修理手册说明书。