一道英语选择Mr.Green is said _____ an experiment to prove the new

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一道英语选择
Mr.Green is said _____ an experiment to prove the new method of solving the problem when young.
A.to do B.to have done C.to be doing D.to have been doing
为什么不能选D?

have been doing的意思是一个动作从过去持续到现在,表示现在还在从事的一个动作.
先看这个题目,sb.is said to do sth.某人据说.,整句话意思是,据说格林先生年轻时曾做了一个实验去验证解决这个问题的新思路.

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