题目内容
Not until the poisonous fog was over __________ to school.
A. couldn’t return the students
C. could the students return
B. the students couldn’t return
D. The students could return
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题目内容
Not until the poisonous fog was over __________ to school.
A. couldn’t return the students
C. could the students return
B. the students couldn’t return
D. The students could return