题目

Mary is short__________ her brother is very tall. A. still        B. nor             C. while         D. when 答案：C 解析: while用作连词，表示“对比”、  “衬托”，可译为“而”。如：He is rich while his sister is poor．他很富有，而他的姐妹却很穷。A项still不是连词；B、D项不合句意。

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