________ I'm mistaken, I've seen that tall man at a party before.
A．IfB．As
C．UnlessD．When
C
C 考察連詞辨析。If如果，as因?yàn)�；unless除非，如果不；when當(dāng)…時(shí)；句義：如果沒有錯(cuò)，我以前在晚會(huì)上遇見過那個(gè)高個(gè)子的男人。故C正確。
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