Tigers wait it is dark.then go out to find their food．( )A．sinceB．untilC．asD．because 题目和参考答案——青夏教育精英家教网—

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15．Tigers wait________ it is dark，then go out to find their food．（　　）

A．

since

B．

until

C．

D．

because

分析老虎一直等到天黑才出去觅食．

解答答案：B；since，自从；unti，直到..as，当…because因为；根据句中的wait是延续性动词，可知该句用until引导，引导延续性的事件状语，故选B．

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．

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