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

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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

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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:whyB:whetherC:whenD:what

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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