问题
选择题
It is necessary for us _______them every day.
A．looking after
B．to look after
C．look after
D．to looking after
答案
答案：B
考查句型：It is necessary for sb to do，对某人来说做什么事情是必要的。It做形式主语，真正的主语是后面的不定式。句意：对我们来说每天照顾他们是必要的。故选B。
