It's been 2 years ____ I went to London and I've been used to liv_英语解答

It's been 2 years ____ I went to London and I've been used to living there
A before B since C after D when
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人气：264 ℃　时间：2019-10-19 13:44:23

解答

b
这是一个句子结构It's been +一段时间+since 过去时的句子