All these days he______on his paper.A、has workedB、has been workingC、was workin

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问题 All these days he______on his paper.

选项 A、has worked
B、has been working
C、was working
D、is working

答案 B

解析题干：这些天他一直在忙着写论文。本题测试时态。all this(these) day(s)，month(s)，year(s)等时间状语一般与现在完成时连用，意为“一段时间以来一直在……”，强调动作的持续，不注重结果。只有B符合要求。

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