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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