[求助]OG10-90请高人指教，顿首！！！

OG10-90:

Since 1986,when the Department of Labor began to allow investment officers's fees to be based on how the funds they manage perform,several corporations began payingtheir investment advisers a small basic fee, with a contract promising higher fees if the managers perform well.

B,  investment officers's fees to be based on the performance of the funds they manage, several corporations began

C, that fees of investment officers be based on how the funds they manage perform, several corporations have begun

D, fees of investment officers to be based on the performance of the funds they manage, several corporations have begun

E, that investment officers's fees be based on the performance of the funds they manage, several corporations began

正确选项：D

问题：“begin”为描述瞬间动作，而非持续动作的动词，如何有现在完成时态“have begun”？“have begun”如何解释？

此题做过数遍，每次看到完成时态的标志词“Since”知道主句谓语动词要用现在完成时态，但看到“begin”每次选择都非常犹豫，请牛牛们指点,顿首！！！

看到这个标题就知道谁的帖子,汗...

强调从1986年开始就已经开始了啊,可以理解为对现在有影响

感谢两位的热心回复，谢谢！

但关于BEGIN非持续性动作的动词而使用完成时态，在下还是难以释怀。非持续性动作的动词不能使用完成时态，这好像是基本语法规则。

“开始”就是开始，要么过去某个时间开始的，要么正在开始或是将来某个时间开始，怎么会持续开始到现在？真是费解！！