Which of the following infinitives functions as an if-clause?

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问题 Which of the following infinitives functions as an if-clause?

选项 A、To be a good citizen, one must obey the law.
B、He opened the door to find the room empty.
C、I came here to study English grammar.
D、To hear you sing, people might take you for a girl.

答案D

解析考查不定式的用法。A中的不定式作目的状语，相当于in order to be a good citizen；B中的不定式为结果状语；C中的不定式也是表目的。只有D表示条件，相当于if引导的条件状语从句，即：If people hear you sing，they might take you for a girl．

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专业英语四级

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Which of the following infinitives functions as an if-clause?

专业英语四级

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