He is one of the boys who______ (很难打定主意) in his class.have trouble(in)making up

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问题 He is one of the boys who______ (很难打定主意) in his class.

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答案 have trouble(in)making up their minds

解析 “很难做”have trouble(in)doing…；“打定主意”make up one’s mind。定语从句修饰先行词boys，因此定语从句的谓语动词应用复数形式，即have；另外，在make up one’s mind短语中，mind有单复数形式的变化，应与one’s一致。

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