If you have trouble pronouncing the word...

If you have trouble pronouncing the word, you can repeat it over and over again _______ you are comfortable with it.

A. unless B. if C. until D. while

C 【解析】试题分析：句意：如果你的发音有问题，你可以一遍又一遍重复直到你对它感到舒服。unless 除非；if 如果； until 直到；while当……的时候。根据句意可知该选C。考点：考查连词。

考点分析：

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