－What did you do your last day off?－I took my dog a walk. A. in; for B. on; forC. on; as

问题补充：

－What did you do your last day off?

－I took my dog a walk.

A. in; for

B. on; for

C. on; as

D. at; on

答案：

A. in; for

(答案→)B. on; for

C. on; as

D. at; on

解析：在休息日用介词on，take for a walk表示散步的意思，故本题选B。