（ ）the Olympic Games will be held in Beijing is not known yet.
问题描述：
（ ）the Olympic Games will be held in Beijing is not known yet.
A.Whenever B.If C.Whether D.That
请问选哪个?说明理由!
我也觉得是C，
答
（ ）the Olympic Games will be held in Beijing is not known yet.A.Whenever B.If C.Whether D.That请问选哪个?说明理由!选C.Whether .引导主语从句.D.That也可以引导,为什么不选呢,因为如果用that的话表示已经确...