Question

I _______ keep dogs for protection, but now I keep them as pets.

A．would rather

B．had better

C．used to

D．have to

Answer 1

C

词义辨析。would rather宁愿；had better最好；used to 过去常常，现在已不再如此；have to不得不，必须。句意：我过去养狗是为了保护，但是现在我把它们作为宠物养。所以选C。