---Mum can I go to the zoo with Linda?-When your homework you can. A. is finished B.

问题补充：

---Mum, can I go to the zoo with Linda?

---When your homework , you can.

A. is finished

B. was finished

C. finishes

D. finished

答案：

(答案→)A. is finished

B. was finished

C. finishes

D. finished

解析：本题的含义是当你的作业被完成了之后，你才可以去动物园。本题when从句使用的是被动句，结构为be+过去分词，本题谈论的是目前的情况，不用过去时，故本题选A。