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

A.workB.will work

C.are workingD.have been working

【答案】D

【解析】

考查時態(tài)語態(tài)。句意:自從疫情爆發(fā)以來,研究者毎天都忙到深夜以找到有效的治愈方法。 時間狀語since the outbreak of the disease提示用完成時態(tài), till midnight表示動作的持續(xù)性,故用現(xiàn)在完成進(jìn)行時,故選D。

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