【题目】Three yellow ducklings sit Mum's back. ( )
A. in B. on C. behind
【答案】B
【解析】
句意：三只小鸭坐……妈妈的背……。on one's back在……背上，介词短语，故选B.
【题目】Three yellow ducklings sit Mum's back. ( )
A. in B. on C. behind
【答案】B
【解析】
句意：三只小鸭坐……妈妈的背……。on one's back在……背上，介词短语，故选B.
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