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I won’t tell the student the answer to ...

 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

 

 A 【解析】:通过题意可以看出是要等学生做一小时后才告诉答案。因为有until引导所以在状语从句中只能一般完成时代替。 【考点】:时态即将来完成进行时态运用于时间状语从句。 【易错点】:因为忽视了将来完成时在时间状语从句只能用一般完成时代替,所以容易错选答案B或者C。 【备考建议】:对于时态在复习过程中要抓住一些关键句型、固定搭配同时还要充分的体味语言环境。
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