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when they have to

Many students face problems when they have to study a subject __________ difficult．（　　） A. that they think it is B. which they think that is C. that they think is D. they think is

2026年09月27日 19:42

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答案是C，考查定语从句．分析题干可知本句中被修饰的先行词是subject，定语从句中they think是插入语，关系代词在定语从句中做主语．A选项中多了it；B选项中多了that；D选项中关系代词不可以省略．所以答案选C．