高等继续教育 / 大学英语语法
正确率：100%
题型描述: 单选题
＿＿＿＿＿ is still unknown when the president is going to make a public speech.
A.That
B.It
C.Which
D.What
＿＿＿＿＿ is still unknown when the president is going to make a public speech.
A.That
B.It
C.Which
D.What
参考答案：
佳题速递：