问题
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
B:will have worked
C:will have been working
D:had worked
正确答案是：
同类题型
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Tom has made great progress recently.—- _________ and _________ .