---Let’s back up. Where was I?
---You about the trip to South Africa.
A. were talking
B. talked
C. are talking
D. would talk
网友回答
(答案→)A. were talking
B. talked
C. are talking
D. would talk
解析：考查时态。句意：—我们回顾一下。我讲到哪里了？—你正讲到去南非的旅行。根据句意说明询问的是在过去的某个时间点上正在发生的事情，所有使用过去进行时的时态。故A正确。