题目内容
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.isn't working
A
“直到学生做了一个多小时,我才会告诉他数学题的答案.”根据上下文应用将来完成时,但用在时间状语从句中,应用现在时代替将来,所以用现在完成进行时.
“直到学生做了一个多小时,我才会告诉他数学题的答案.”根据上下文应用将来完成时,但用在时间状语从句中,应用现在时代替将来,所以用现在完成进行时.
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