问题
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
B:drop out
C:drop off
D:drop by
正确答案是：
同类题型
Mozart’s birthplace and the house ______ he composed ‘The Magic Flute’ are both museums now
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It was not until the accident happened _______ aware of my own foolishness.