问题
选择题
— I called you at nine this morning, but there was no answer.
— Oh, sorry, I ______ with my sister in the shopping center.
A．shop
B．was shopping
C．shopped
D．will shop
答案
答案：B
本题表示过去具体时间所做的事用过去进行时，结构为be+现在分词，故本题选B。