—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.

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1. (2018·无锡模拟) —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

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