Question

【题目】Bob took a photo of his girlfriend while she _________ at the party.
A.dances
B.was dancing
C.has danced
D.is dancing

Answer 1

【答案】B
【解析】句意：当她在晚会上跳舞时，Bob给他女朋友拍了一张照片。由句中took为过去时，由此排除A，D;而while表示“当……时候”，应用过去进行时was +doing ，故选B。