I recognized him at once, as I had seen him______.

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问题 I recognized him at once, as I had seen him______.

选项 A、since
B、before
C、ago
D、forward

答案B

解析 本题主要考查时间连词。句意:我立马认出了他,因为我以前看见过他。这里没有具体表明多长时间以前,只能用before而不用ago,意为“以前;从前”,且before以副词的形式位于被修饰语后,常与过去完成时连用。所以本题答案为B。
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