题目内容
6.Don't come into the lab ________ you are asked to.( )| A. | unless | B. | until | C. | because | D. | since |
分析 除非叫你去,否则不要去实验室.
解答 答案A unless意为"除非,如果不"引导条件状语从句;until意为"直到…才"引导时间状语从句;because意为"因为"引导原因状语从句;since意为"自从…以来"引导时间状语从句.根据"you are asked to"以及"Don't come into the lab"可知如果不叫你去实验室,你就不要去,所以要用unless,故选A.
点评 首先要掌握这几个连词的意思及用法,然后结合具体的语句做出正确选择.
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