—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．ifB．becauseC．untilD．while
C
考查連詞. if 是否,如果;because因為;until直到;while然而,當……時；句意：我擔心我做不到�！�，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。固定結(jié)構(gòu)not…until直到...才，故選C。
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