培优练习
I. 单项选择（共15小题；每小题2分，满分30分）
1. _____ fails to see this will make a big mistake.
A. That B. Whoever C. Whether D. Whether or not
2. __ we need more equipment is quite obvious.
A. What B. Whether C. That D. Whatever
3. Has it been announced _____?
A. when are the planes to take off B. that are the planes to take off
C. where are the planes to take off D. when the planes are to take off
4. That is _____ we all support his idea.
A. what B. why C. where D. when
