—Shallwegooutforawalk?—Sorry.Ican’t.I　　　　myhomework.A.d...

问题详情：

—Shall we go out for a walk?

—Sorry. I can’t. I　　　　my homework.

A. do   　　　　　　B. did

C. am doing 　　　D. was doing

【回答】

C

知识点：动词时态

题型：选择题