Question

It is necessary for us _______them every day.

A. looking after
B. to look after
C. look after
D. to looking after

Answer 1

答案B
考查固定句型。It is +形容词+for sb. to do sth.“做某事对某人来说......”其中，it是形式主语，真正的主语是动词不定式。句意“每天照顾他们对我们来说是必需的。”故选B。