It is often difficult (decide) ______ what to do.to decide本题考点是动词不定式。句中it作形式主语，为

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问题 It is often difficult (decide) ______ what to do.

选项

答案 to decide

解析本题考点是动词不定式。句中it作形式主语，为it is...to do sth。本句大意：常常很难决定去做什么。

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