问题
选择题
When the sick mother got up, she was surprised to find that her six-year-old daughter _______ in the kitchen.
A．had cooked
B．has cooked
C．was cooking
D．cooked
答案
C
题目分析：句意：当生病的妈妈起来的时候，她很惊讶的发现她六岁的女儿正在厨房做饭。Cook这个动作是发生在：When the sick mother got up,所以用过去进行时，选C。