I a museum with my friends at this time yesterday.A. am visitingB. was visitingC. visited

问题补充：

I a museum with my friends at this time yesterday.

A. am visiting

B. was visiting

C. visited

D. will visit

答案：

A. am visiting

(答案→)B. was visiting

C. visited

D. will visit

解析：句意：在昨天的这个时候，我正在和我的朋友参观博物馆。句子有at this time yesterday在昨天的这个时候，表示动词过去正在进行。故选B.