c,'so' cant leat a subordinate clause,"after" is as same as previous one."before" is obviously illogical.
just for your reference
It's a long time_____we met last
It's a long time_____we met last
A.so B.after C.since D.before请告诉我答案,顺便说明原因,谢谢
A.so B.after C.since D.before请告诉我答案,顺便说明原因,谢谢
英语人气：212 ℃时间：2020-03-19 21:43:36
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