-What's up? You look worried.Well,I_____on the problem for 5 hours but I haven't got a single clue.A．have workedB．workedC．will workD．have been working-高中英语-n多题

◎ 题干

-What's up? You look worried.
Well,I_____on the problem for 5 hours but I haven't got a single clue.

A．have worked	B．worked
C．will work	D．have been working

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◎ 解析

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◎ 知识点

根据n多题专家分析，试题“-What's up? You look worried.Well,I_____on the problem for 5 hours but I haven't got a single clue.A．have workedB．workedC．will workD．have been working…”主要考查了你对【一般现在时】，【将来进行时】，【过去完成进行时】，【过去将来时的被动语态】等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。

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