it is five years since we began learing English 为什么是it was

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it is five years since we began learing English 为什么是it was

原本是It has been five years.现在成了固定句型It is...since...

? is or was

因为后面since引导的时间状语从句的谓语是begin的过去式began,为了保持时态的一致性,所以前面的is要改成was