The April Fool's tradition is said__________ in the sixteenth century.A to start B to be startingC to be started D to have started 答案是D 为什么 不用被动?

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The April Fool's tradition is said__________ in the sixteenth century.
A to start B to be starting
C to be started D to have started
答案是D 为什么 不用被动?

is said to ... (据称,据说 .)这样的句式,只要后面讲述的时间点是过去,一律都用完成时.