问题补充：
Yao Ming works hard on his English and .
A. so Liu Xiang does
B. so is Liu Xiang
C. so does Liu Xiang
D. so Liu Xiang is
答案：
A. so Liu Xiang does
B. so is Liu Xiang
(答案→)C. so does Liu Xiang
D. so Liu Xiang is
解析：so引导的倒装句，根据下文的主语是否与上文一致，若一致，就用不完全倒装，如果与上文不一致，就用完全倒装，本题的第二句的主语与第一句的主语不一致，故选C
