Question

–I called you yesterday afternoon, but you were not at home.
--Sorry, I _________ some shopping with my mother then .

A．is doing

B．do

C．was doing

D．will do

Answer 1

C

解析试题分析：句意：---昨天下午我给你打电话了，但是你没有在家。----对不起，我那个时候正在和我的母亲购物。根据语境下文的回答应用过去进行时，was doing 的结构，根据句意故选C.
考点：考查动词时态的用法。