题目内容
________ you make an appointment (约定) with the manager in advance, it’s impossible for you to meet him now.
A.When B.Unless C.Since D.If
练习册系列答案
相关题目
题目内容
________ you make an appointment (约定) with the manager in advance, it’s impossible for you to meet him now.
A.When B.Unless C.Since D.If