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It was 20 minutes ________ they finished the work.

[  ]

A.until
B.when
C.before
D.as soon as

答案:C
解析:

考查连词用法。before表“……才/就……;在……之前”;when表“当……时候”;until表“到……为止”;as soon as表“一……就……”。句意为“20分钟后他们就完成了这项工作”。可知C项正确。


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