What does Dr. Michael Alderman say about a randomized, controlled trial？A．It has been succ

What does Dr. Michael Alderman say about a randomized, controlled trial？

A．It has been successfully conducted.

B．It should be carried out.

C．It is already under way.

D．It is too late to try it.

请帮忙给出正确答案和分析，谢谢！

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