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______ you keep trying till the end, you will never know how strong you are!
A．AlthoughB．If
C．UnlessD．Because
C

試題分析：. Although盡管； If如果； Unless="if" not如果不；Because因為。句意為：如果你不堅持嘗試到最后，你將永遠不知道你有多堅強！故選C。
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