题目内容
______ you keep trying till the end, you will never know how strong you are!
| A．Although | B．If |
| C．Unless | D．Because |
C
解析试题分析：. Although尽管； If如果； Unless="if" not如果不；Because因为。句意为：如果你不坚持尝试到最后，你将永远不知道你有多坚强！故选C。
考点：考查连词
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