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The researchers ______ till midnight eve...

The researchers ______ till midnight every day since the outbreak of the disease to find an effective cure.

A.work B.will work

C.are working D.have been working

 

D 【解析】 考查时态语态。句意:自从疫情爆发以来,研究者毎天都忙到深夜以找到有效的治愈方法。 时间状语since the outbreak of the disease提示用完成时态, till midnight表示动作的持续性,故用现在完成进行时,故选D。  
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