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新概念三的一个问题第35课课后第六题答案给的是D,但B哪里不行?研究了好久,实在不懂~The staff must ha

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新概念三的一个问题
第35课课后第六题
答案给的是D,但B哪里不行?研究了好久,实在不懂~
The staff must have found it impossible_______to say "it serves him right".
(a)they were not tempted
(b)for them not to be tempted
(c)to be tempted
(d)not to be tempted
我们说for sb. to do sth.时,只能用在形式主语It开头的句子里,比如:It must have been impossbile for the staff to say "it serves him right."在It is ... for sb. to do sth.的结构里,sb.是逻辑上的真正主语.
而The staff must have found it impossible not to be tempted to say "it serves him right"这句话里,已经有了真正的主语staff,不能再用for引出逻辑的主语them,否则就会出现主语的重复.