It is about five years____the Green family came to China.A,since _英语解答

It is about five years____the Green family came to China.A,since B,before C,until.为什么选A

人气：231 ℃　时间：2019-10-29 19:49:59

解答

这是个常用的句型：
It is + 时间段+ since时间从句（用一般过去时）
自从.以来已经有.长的时间了.