题目内容
I had just taken a bite of my hot dog ________ I heard a familiar voice yelling at me from across the crowded school yard.
A. before B. while C. since D. when
【答案】
D
【解析】考察连词。该句为固定句型,sb had just done sth when sb did sth
意为某人刚做完某事,突然……
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