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【题目】I think it is a good idea _________ parents to do something instead.
A.to help
B.helps
C.helping
D.help

【答案】A
【解析】考查动词不定式作真正的主语,形式主语是it,结构:It is+名词短语+to do sth.;句意:我想帮助父母来做些事情来代替是一个好的想法。故选A。

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