nobody could predict the difficulty they at first ____ had the projectA.carry out B.carried out C.carrying out D.to carry out

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nobody could predict the difficulty they at first ____ had the project
A.carry out B.carried out C.carrying out D.to carry out

选B.carried out 过去某动作carried out（执行；进行）一直持续到现在将来可能还要延续下去.没人可以预见起初他们执行该项工程时遇见的困难.
the plan to be carred out 的意思是将要实施的计划
易误作C.carrying out 动名词作从句主语.唯因有had,排除 .
the plan carried out 的意思是已经实施的计划.
过去完成时(past perfect)：
①表示发生在过去的动作对现在造成的某种影响或结果,用来指定在另一个过去行动之前就已经完成了的一个事件.
②过去某动作一直持续到现在将来可能还要延续下去.句中的动作发生在过去之前（过去的过去）,即过去完成时动作发生在过去的过去.He said he had been to Beijing twice.他说他已经去过北京两次.（因为“说”said就是过去式,而去北京的动作发生在说said 的过去,所以用过完而不用现完.
主语+had+过去分词vpp.(done)
①肯定句：主语+had+过去分词+其他.
②否定句：主语+had+not+过去分词+其他.
③一般疑问句：Had+主语+过去分词+其他?
肯定回答：Yes,主语+had
否定回答：No,主语+hadn't
④特殊疑问句：特殊疑问词或词组+一般疑问句（Had+主语+过去分词+其他）?
⑤被动语态：主语+had（hadn't)+been+过去分词+其他

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