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【题目】They realized that the problem Ted put forward was difficult _______.

A.to solveB.solvedC.to be solvedD.solving

【答案】A

【解析】

考查非谓语动词。句意:他们意识到泰德提出的问题很难解决。结合短语be difficult to do sth.“难以;很难……”后跟不定式,且在此结构中,若主语与其后的不定式为动宾关系,那么该不定式习惯上要用主动形式表示被动意义。故用to solve形式。故选A

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