Three days had gone by_I received her e-mail

Three days had gone by_I received her e-mail
A.as B.since c.before D.when
选哪个?why?
英语人气:924 ℃时间:2019-11-15 05:09:11
优质解答
before是before,为什么when不行?不好意思,一直用的手机,没看见追问,我记得应该是个固定搭配,嘿嘿
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