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【题目】When the haze got more serious, the students had ________ on the Internet at home.

A.to learnB.learnedC.learningD.learn

【答案】A

【解析】

句意:当雾霾变得更严重时,学生们不得不在家里上网学习。

考查固定搭配。A. to learn(不定式);B. learned(一般过去式、过去分词); C. learning(现在分词、动名词);D. learn(原形); 从文字表层意思推断,空格指“不得不在家上网学习have to do sth意为不得不做某事;故选A

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