Question

Jack     his pet dog every day. The dog must feel sad when he’s alone all day long.

A. should walking          B. should to walk        C. had better walk           D. had better to walk 

Answer

C

【解析】

试题分析：句意：杰克最好每天都要遛遛他的宠物狗。那条狗一整天都单独呆着一定感到难过。had better do sth意为“最好做某事”；should do sth意为“应该做某事”；故选C。

考点：考查情态动词。