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问题: to eat a balanced diet is very important

同义句
___very important ____ eat a balanced diet.

解答:

答案:it's very important to eat a balanced diet.

分析:To eat a balanced diet is very important.是不定式做主语
it's very important to eat a balanced diet.是it作形式主语
考查的是不定式和形式主语的转换问题。