________ you make an appointment (约定) with the manager in advance, it’s impossible for you to meet h...
2022-05-23 08:19:17 147次 上海市崇明区2019-2020学年九年级上学期教学质量调研测试（一模）英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
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
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