___(解决）this problem is more difficult than we think.

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___(解决）this problem is more difficult than we think.
请说明原因.

应该用solve的动名词形式solving.
请你仔细观察一下这个句式,是一个典型的“主系表”结构,is即是句中的系动词,相当于谓语的成分,而后面的difficult是形容词作表语,只不过加了一个比较级.因此,最前面的"解决这个问题"就应该是这个句子的主语.而我们知道,只有名词、代词、动词不定式（如To see is to believe:眼见为实或用倒装结构如It is not easy to learn English well）才能作主语,因此这里就必须将solve这个动词转化为名词形式,即变为动名词solving,其中this problem是作为solve的宾语出现的.

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