One day while I ______ along the street, I ______ someone calling.

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问题 One day while I ______ along the street, I ______ someone calling.

选项 A、walked ;was hearing
B、was walking; has heard
C、was walking; heard

答案C

解析 while意为“当……的时候”。句意:一天,当我在街上散步时听到有人叫我。
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