—What were your parents doing when you phoned me last night?

—They ________with my grandparents.

A．were talking

B．talked

C．are talking

D．talk

1920年，一批在俄国十月革命中流亡出来的（）窜入中国境内并被中国地方政府扣留，关押在莫高窟，对莫高窟的壁画和塑像造成了严重的破坏。