Question

________ I'm mistaken, I've seen that tall man at a party before.

A．If	B．As
C．Unless	D．When

Answer 1

C

C 考察連詞辨析。If如果，as因為；unless除非，如果不；when當…時；句義：如果沒有錯，我以前在晚會上遇見過那個高個子的男人。故C正確。