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They went on doing their experiment they had failed many times. [ ] A．unlessB．un

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They went on doing their experiment they had failed many times. [ ] A．unlessB．un

They went on doing their experiment_________ they had failed many times.

[]

A．unlessB．untilC．thoughD．as long as

试题答案

答案：C

提示：

though或although引导让步状语从句

标签：experimenttheirhadtheywent

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