They had to before they finished the course because they were not well disciplined.A. drop

发布时间：2020-08-29 20:04:13


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

网友回答

A. drop in
(答案→)B. drop out
C. drop off
D. drop by
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