They had to_________ before they finished the course because they were not well disciplined. A.drop ...
2023-01-03 02:19:57 39次 默写重点单词与词组 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
They had to_________ before they finished
the course because they were not well disciplined.
A.drop in B.drop
out
C.drop off D.drop
by
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