题目内容

It is necessary for us _______them every day.
A．looking afterB．to look afterC．look afterD．to looking after
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。
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