---What will you do next Sunday? ---Maybe do some shopping for I go to school on Sunday.

问题补充：

---What will you do next Sunday?

---Maybe do some shopping, for I go to school on Sunday.

A. mustn’t

B. can’t

C. don’t have to

D. had better not

答案：

A. mustn’t

B. can’t

(答案→)C. don’t have to

D. had better not

解析：