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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