Iwon’ttellthestudenttheanswertothemathproblemuntilhe&

发布时间：2020-08-12 19:19:11

I won’t tell the student the answer to the math problem until he      on it for more than an hourA.has been workingB.will have workedC.will have been workingD.had worked

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A解析试题分析：考查时态：句意：我不会告诉学生数学题目的
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