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题目
题型:不详难度:来源:
He had to___ before they finished the course because they were not well disciplined.
A.drop inB.drop outC.drop offD.drop by

答案
B 
解析
这里的短语意思各不相同,drop out 退学,drop in /drop by 顺便拜访,drop off 下降,减少。
核心考点
试题【He had to___ before they finished the course because they were not well discipli】;主要考察你对动词及动词短语辨析等知识点的理解。[详细]
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