If you have trouble pronouncing these wo...

If you have trouble pronouncing these words, you can repeat them over and over again ________ you are comfortable with them．

A．unless B．if

C．until D．while

C 【解析】试题分析：句意为：这些词如果你发音有困难，你可以重复发几次直到你适应它们。unless：除非、如果不， if ：如果、是否， until ：直到……， while：当……时候。根据语境可知应选C。考点：考查连词。

考点分析：

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