I a museum with my friends at this time yesterday.
A. am visiting
B. was visiting
C. visited
D. will visit
网友回答
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.