【题目】The teacher along with her students _________ the Palace Museum when we came across her.
A. were visiting B. was visiting
C. has visited D. have visited
在线课程【答案】B
【解析】
试题分析：考查动词的时态。句意：老师与他的学生正在参观故宫这时我碰到他。Be doing when…正在做某事这时。。，故选B项。
考点 : 考查动词的时态