It remains to be seen the newly formed committees policy can be put into practice.A. th

问题补充：

It remains to be seen the newly formed committees policy can be put into practice.

A. that

B. which

C. what

D. whether

答案：

A. that

B. which

C. what

(答案→)D. whether

解析：D考查名词性从句。句意：新组成的委员会制定的政策是否能实施还有待观察。题干中it是形式主语，空格处引导主语从句，whether符合句意。