"_____ and then you can pass the exam." my teacher said."_____ and then you can pass the exam." my teacher said.A.Working hard B.Work hard C.Worked hard我知道这题答案是B,但是我想请问一下,为什么?

问题描述:

"_____ and then you can pass the exam." my teacher said.
"_____ and then you can pass the exam." my teacher said.A.Working hard B.Work hard C.Worked hard
我知道这题答案是B,但是我想请问一下,为什么?