It's time for bed now .Before you sleep ,remember to turn of

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/16 11:58:16

It's time for bed now .Before you sleep ,remember to turn off the recorder. Press the ___key.
A. PLAY B. STOP C. ON/OFF D. PAUSE
答案是C ,为什么?求解释.

ON/OFF key就是指“开/关”键.从句意（turn off the recorder）来看,要表达关闭recorder之意,句意还表明此时的recorder在此前已经被按了“开/关”键,目前处于“ON”（“开启”）的状态,再按一次开关键就是“OFF”的状态,即“关闭”状态,只有C最符合实际,另外,“STOP key”为”停止“键,仅表示停止放音,并不表示电源的关闭,但如果要继续放音,必须再按”PLAY key“；”PAUSE key“为”暂停键“,只是暂时停止,可以再按一次本键,快速继续,电源也没有被关闭.

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