题目内容
17．Several days has passed_______the air crash（空难） happened．（ ）| A． | since | B． | after | C． | as |
分析 自从空难发生以来，已经过去好几天了．
解答 答案A since意为"自从…以来"，常和完成时连用；after意为"在…以后"；as意为"当…的时候"，强调两个动作同时进行．根据"has passed_______the air crash happened"可知是从过去的某个时间开始，延续到现在的动作．所以要用since．故选A．
点评 首先要掌握since，after，as这几个连词的用法，然后结合具体的题意，做出正确选择．
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