摘要：23．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．would have worked D．had worked
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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
查看习题详情和答案>>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
查看习题详情和答案>>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
查看习题详情和答案>>