问题
选择题
I think ___is necessary ___ my 20-year-old daughter to have her own mobile.
A．that; of
B．it; of
C．that; for
D．it; for
答案
答案：D
考查固定结构，it is +adj.+for sb to do sth对某人来说做某事怎么样，it是形式主语，真正的主语是不定式to have her own mobile。选D。