—Imustsaygoodbyetoyou．Ifeelveryupset．—Cheerup! Itwon'tb...

问题详情：

—I must say goodbye to you．I feel very upset．

—Cheer up!  It won't be three months          we meet again in Australia．

       A．before              B．since                C．after                D．when

【回答】

A

知识点：连词

题型：选择题