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        1. 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,對(duì)某人來說做什么事情是必要的。It做形式主語,真正的主語是后面的不定式。句意:對(duì)我們來說每天照顧他們是必要的。故選B。
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