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

发布时间:2020-08-16 18:25:30

Up to now, they      a good way to solve that problem.
A. didn’t find
B. can’t find
C. hadn’t found
D. haven’t found

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A. didn’t find
B. can’t find
C. hadn’t found
(答案→)D. haven’t found
解析: 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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