They___friends since they met in sh.A.have madeB.have becomeC.have turnedD.have been请说明理由

They___friends since they met in shanghai?A.have made B.have become C.have been D.have had They___friends since they met in sh.A.have madeB.have becomeC.have turnedD.have been请说明理由 since GSB SINCE since是什么意思? since是什么意思? ever since since是什么意思 since when since 用法 SINCE用法 SINCE怎么样 since then可以说成 since that time since +延续性动词 中 since 的意思? have since been 和 have been since 英语翻译since …… 现在完成时+since+句子 since什么意思