Question

I think ___is necessary ___ my 20-year-old daughter to have her own mobile.

1. A.
   that; of
2. B.
   it; of
3. C.
   that; for
4. D.
   it; for

Answer 1

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。