问题
选择题
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
答案：D
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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：D