_____ shoulder to shoulder with a girl, I felt very embarrassed.
A.Spotting shopping
B.Spotted shopping
C.Having spotted to shop
D.Spotted to shop
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B解析考查非谓语动词，根据句子结构可知该部分为状语，spot意为发现，认出，与主语I之间是被动关系，故排除AC，spot用语同see /watch sb doing sth，意为发现某人干某事。句意为被发现跟一个女孩肩并肩购物，我感到很尴尬。