Question

tom said he___at that time A. is cooking B. cooked C. was cooking D.cooks

选什么 理由 都讲清楚 啊！

Answer 1

tom said he_C__at that time A. is cooking B. cooked C. was cooking D.cooks
首先是said过去时，后面排除AD
另外这里有at that time表示在那个时候，所以是在哪个时候他正在做饭，选择C

Answer 2

was cooking

Answer 3

选C，过去进行时态

Answer 4

C. was cooking

Tom said 为一般过去时
he___at that time 为宾语从句。说Tom当时正在干什么，所以用过去进行时。