Someone called me up in the middle of the night, but they hung up I could answer the phone.
A．as
B．since
C．until
D．before
答案：D
题目分析：as因为，随着；since由于，自从……以来； until直到；before在……之前。句意：半夜有人给我打电话，但是在我回电话之前，他们就挂断了。结合语境可知选D。
点评：连词在句子中主要起联系上下文的作用，他们之间的区别就是表示逻辑关系的不同，所以在解题时先要理解上下文含义，然后根据上下文逻辑关系选择合适的连词。连词的用法都比较多，语义之间还有交叉，熟记其基本应用规则，了解其区别，注意固定搭配对象，是做好此类题型的关键。
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| John Smith is fifteen years old. He is a student in No.3 Middle School. He gets a part-time 1 because he needs some 2 . He works in a supermarket after 3 from Monda  y to Friday and all 4 on Saturday. He helps people look after their kids and he works with 5 kids. He thinks it is great 6 . After schooln he 7 a bus to the supermarket. He 8 there atr about 4:30. He works 9 4:30 to 8:30. He 10 home at 9:00. John likes his job very much. | ||||
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