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15．---So you were in the supermarket __________ you heard a strange sound，right？
---That's true．I ran out as quickly as possible．（　�。�
A．whenB．whileC．thenD．which

分析 --那么你當時是在超市里，在那時聽見了一個奇怪的聲響，對吧？
--對的．我盡可能快的跑了出去．

解答 答案：A　
when意為"在…時"引導時間狀語從句；while作從屬連詞時后面的時間為持續(xù)的時間；then意為"那時"不能引導時間狀語從句；which意為"哪一個"．根據"you heard a strange sound"以及"you were in the supermarket"可知在超市里的時候，突然聽到了奇怪的聲響．when含有"在…時"的意思，故選A．

點評 when和while這兩個詞的用法有時很難區(qū)分，在切實掌握其用法的基礎上，經過認真揣摩，仔細考慮才能做出正確選擇．

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