Bob took a photo of his girlfriend while she____ ____at the party. (dance)
答案
was,dancing
知识点:动词时态:过去进行时

根据Bob took a photo of his girlfriend得知该用过去时,再根据句意“当鲍勃的女朋友跳舞时,他给她照了一张照片。”因此应用过去进行时态,正确答案为was dancing。

略
