_____we are successful, we can be sure that we did our best.

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问题 _____we are successful, we can be sure that we did our best.

选项 A、Provided that
B、If only
C、If or not
D、Whether or not

答案D

解析 本题考查连词的用法。句意为“不管成功与否,我们可以肯定我们尽了最大的努力”。provided“如果……”,其后一般跟条件状语从句;if only“要是……就好了”;没有if or not这种用法;whether or not“不论,是否”。故本题选D。
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