I won’t tell the student the answer to the math problem until he ____on it for m
题型:不详难度:来源:
I won’t tell the student the answer to the math problem until he ____on it for more than an hour.A.has been working | B.will have worked | C.will have been working | D.had worked |
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答案
A |
解析
正确答案A。在时间状语从句中用一般现在时代替将来时,故排除选项B和C;据时态呼应规律排除选项D;学生一直在做数学练习,直到规定时间完毕教师才公布答案。 某个动作或过程过去已经开始,一直持续到说话时刻,有可能继续延续。因此,现在完成进行时仍带有进行时的持续性;某个动作或过程过去的过去已经开始,一直持续到过去某个时刻,有可能继续延续,用过去完成进行时。 |
举一反三
Father _____for London on business upon my arrival, so I didn’t see him.A.has left | B.left | C.was leaving | D.had left |
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The Browns lived____in the old society.A.miserable life | B.miserable live | C.a miserable life | D.miserable lives |
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Being a teacher,she dreamed____turning a deaf-blind creature into a useful human being. |
____is known to all, good friends _________ happiness and value to life.A.It; add | B.As; add | C.It; add up | D.As; add to |
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he young man ________ a suggestion at the meeting.A.come about | B.come into | C.come up with | D.come out with |
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