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If you often feel tired and can’t focus your attention，that is________you have to stop working too h

题目简介

If you often feel tired and can’t focus your attention，that is________you have to stop working too h

题目详情

If you often feel tired and can’t focus your attention，that is________you have to stop working too
hard and to have a rest.

[ ]

A．why
B．whether
C．when
D．what

题型：单选题难度：中档来源：山东省同步题

答案

C

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