-When I called Tom yesterday,he ( )in the park with his kids.

题目

-When I called Tom yesterday,he ( )in the park with his kids.
-When I called Tom yesterday,he ( )in the park with his kids.
A.took photos B.takes photos C.was taking photos D.is taking photos
答案是哪个,为什么呢?

答案

此句为 过去进行时态
题意为：当我昨天跟Tom打电话的时候,他正在公园与他的孩子一起玩耍
因此选 C
过去进行时的构成：过去式的be动词+doing