It is difficult for a two-year-old child (read) _______this book.

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问题 It is difficult for a two-year-old child (read) _______this book.

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答案to read

解析 不定式的固定句型:It is +adj.+for+sb.+to do sth.。该句型的意思是“做…对某人来说是…”。其中it为形式主语,真正的主语是后面的不定式to do sth.。
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