Six years has passed since he began to learn English.为什么Six years用has而不用have呢?

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• Six years has passed since he began to learn English.为什么Six years用has而不用have呢?
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• Six years has passed since he began to learn English.为什么Six years用has而不用have呢?
• began to enjoy a ten-day spring holiday each year(同义句）
• ____ six years since I began studying English.A.There are B.It was C.It is D.They have been