-I called you at nine this morning but there was no answer. - Oh sorry. I with my cousi

问题补充：

-I called you at nine this morning, but there was no answer.

- Oh, sorry. I with my cousin in the supermarket.

A. shopB. was shoppingC. will shop

答案：

解析：考查情景交际和过去进行时。“今天早上九点我给你打电话了，但没人接。”“对不起，那时我正在和表弟一起在超市购物。”过去某个时刻正在发生的动作，用过去进行时。故选B。