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It's been 2 years ____ I went to London and I've been used to living thereA before B since C after D when请讲解

题目详情
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
请讲解
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答案和解析
b
这是一个句子结构It's been +一段时间+since 过去时的句子