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 |
相关知识点
推荐套卷
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 |