这个问题我也曾问过老师,老师是这样回答的：
since是完成时标志.主句一般用完成时,从句+过去式/表示过去的时间点.但当主句是多长时间时（如本句的six years ）完成时、一般现在时都可.
It _is/has been_(be) six years since we came to Shenzhen
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