____ I'm mistaken, I've seen that tall man at a party before.
A．IfB．AsC．UnlessD．When
C

試題分析：句意：如果我沒有認(rèn)錯的話，我以前在聚會上見過那個人。這里用unless引導(dǎo)條件狀語從句，意思是“除非，如果不”，if引導(dǎo)條件狀語從句，意思是“如果”，As“正如，因?yàn)椋S著”，when“當(dāng)…時候”，引導(dǎo)時間狀語從句。所以選C。
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