( )I’m mistaken, I’ve seen that man before.

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问题 ( )I’m mistaken, I’ve seen that man before.

选项 A、Unless
B、If
C、Because
D、Provided

答案A

解析 词义辨析。unless若不,除非,如:He won’t go to sleep unless you tell him a story.除非你给他讲故事,他才肯睡觉。provided及providing意为“只要,以…为条件”,后接that从句。
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