Up to now, they _________ a good way to solve that problem.A.didn’t findB.can’t findC.hadn’t foundD.

题目简介

Up to now, they _________ a good way to solve that problem.A.didn’t findB.can’t findC.hadn’t foundD.

题目详情

Up to now, they _________ a good way to solve that problem.
A.didn’t findB.can’t findC.hadn’t foundD.haven’t found
题型:单选题难度:中档来源:不详

答案

D
考查时态。Up to now,到现在为止,是现在完成时态的标志,所以选D。

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