"The matter required______,"they all said.A.to look into B.being looked into C.to be looked D.looking into

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"The matter required______,"they all said.
A.to look into B.being looked into C.to be looked
D.looking into

答案为D.“这件事需要调查.”他们都说.
考查某些动词主动形式表被动含义的用法.want (=need)(需要),need(需要),require(需要)后要用动名词,既必须用主动结构表示被动意义,例如:
  These young seedlings will require/need looking after (=need to be looked after) carefully.
  这些幼苗将需要小心的照管.
  Your hair wants/needs cutting (needs to be cut).
  你的头发该剪了.
再就是注意动词短语:look into调查

看来高手有不少,答案看楼上的

required to be done
或者
require doing
两个说法意思相同,第二种一般叫做“主动语态表示被动”
C项如果最后加上个into的话就可以选了