问题
选择题
(2013·陕西高考)It remains to be seen ________ the newly formed committee's policy can be put into practice.
A．that
B．which
C．what
D．whether
答案
答案：D
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。