◎ 题干
Liu Xiang was injured in the first round and had to _____ of the 2008 Beijing Olympic Games.
[     ]
A. drop off
B. drop back
C. drop by
D. drop out
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Liu Xiang was injured in the first round and had to _____of the 2008 Beijing Olympic Games. [ ]A. drop offB. drop back C. drop byD. drop out…”主要考查了你对  【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。