—I’m afraid that I can’t do it.

—Oh, you should believe in yourself. You won’t know what you can do______ you try it.

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

C 【解析】試題分析：句意：--我擔(dān)心我做不到。—哦，你應(yīng)該相信自己。直到你嘗試過后，你才能直到自己能做什么。if 是否，如果；because因?yàn)椋籾ntil直到；while然而，當(dāng)……時(shí)。固定結(jié)構(gòu)not…until直到……才，所以選C。
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