Jill found it difficult ______ (explain) his beliefs to Philip.

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问题 Jill found it difficult ______ (explain) his beliefs to Philip.

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答案to explain

解析 非谓语动词。当不定式to explain作直接宾语,它后面还有补足语difficult时,需用形式宾语it代替不定式,而把不定式(真正的宾语)放在补足语之后。因此,应填to explain。
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