Question

(2005懷化市)

It's necessary for us ________ good to people with AIDS.

[　　]

A．be

B．a(chǎn)re

C．to be

D．is

Answer 1

答案：C
解析：

考查常用句式。it作形式主語，不定式做真實主語，即It is... (for sb) to do sth。