he()in the laboratory the whole morning.A.has been working ,B.is working,c.has worked

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he()in the laboratory the whole morning.A.has been working ,B.is working,c.has worked
he()in the laboratory the whole morning.A.has been working ,B.is working,c.has worked

he()in the laboratory the whole morning.A.has been working ,B.is working,c.has worked
B
整个上午他一直在实验室工作着.

这个问题,得看说话的是什么时候了,A为说话时 动作还在进行,C是已经完成了,对现在造成了影响