——Jack?Jack?Can you come?——Imy homework.A. doB. will doC. am doingD. was doing

问题补充：

——Jack?Jack?Can you come?

——Imy homework.

A. do

B. will do

C. am doing

D. was doing

答案：

A. do

B. will do

C. am doing

D. was doing

解析：本题中根据语境可知我正在做作业，用现在进行时，结构为be+doing，故本题选C。