【題目】It's hard ________ to you how serious the danger is.

A. to explaining B. explained

C. explain D. to explain

【答案】D

【解析】句意：很難向你解釋那個危險有多嚴(yán)重。根據(jù)句型It’s hard to do sth很難做某事，故此處用動詞不定式to explain。故選D。

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