問題詳情：
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
【回答】
C。考查連詞辨析。句意: 如果這些單詞你發音有困難, 你可以一遍遍地重複, 直到你熟練爲止。unless“除非; 如果不”; if“如果”; until“直到……才”; while“當……時”。
知識點：連詞
題型：選擇題
