Which of the following infinitives functions as an if-clause?
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.
【正确答案】
D
【答案解析】
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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