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求教 The committee(委员会) planned to ___the problem ,but failed

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求教 The committee(委员会) planned to ___the problem ,but failed to do so A
3.The committee(委员会) planned to ___the problem ,but failed to do so .
A.solving B.to solve
C.have solved D.have be solved
求教 The committee(委员会) planned to ___the problem ,but failed
答案:C.
1)固定搭配:plan to do sth“计划做某事”,即to后必须加动词原形,由此排除A;
2)B中多了一个to,排除;
3)C中的(to) have solved为不定式to solve的完成式,即“计划早就做了某事”;
而D表示句子主语the committee“委员会”和动词短语solve the problem之间为被动关系,明显不通,排除.
4)所以正确答案为C.