Up to now, they _________ a good way to solve that problem.A.didn’t findB.can’t
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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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答案
D |
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。 |
举一反三
These students will graduate from college next summer, by which time they in college for four years.A.have studied | B.had studied | C.will have studied | D.will be studying |
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I feel sorry for myself .If I more efforts to my studies , I wouldn’t be doing a job with such low wages. A devoted B had devoted C should devote D were to devote |
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He _______ in a university for five years, but now he runs a company of his own.A.has taught | B.had taught | C.taught | D.has been teaching |
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