all the student must follow their teacher's ( )while they are doing this experimentA.instructions B.instruction C.an instruction D.the instructions

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all the student must follow their teacher's ( )while they are doing this experimentA.instructions B.instruction C.an instruction D.the instructions
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all the student must follow their teacher's ( )while they are doing this experimentA.instructions B.instruction C.an instruction D.the instructions
all the student must follow their teacher's ( )while they are doing this experiment
A.instructions B.instruction C.an instruction D.the instructions

all the student must follow their teacher's ( )while they are doing this experimentA.instructions B.instruction C.an instruction D.the instructions
A
没啥好解释,instructions 是指示,加个s是固定的

teacher不要偏s

我觉得是B。instruction是名词,不可数名词

A
instruction是指示,已经有their teacher's作限定字,所以不加an或the,加上-s,因为老师不可能只发一个指令。希望我能帮助你解疑释惑。