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He was in great trouble, but he acted _______ nothing had happened.
A.even ifB.as ifC.unlessD.until
B
连词辨析。A.即使  B.好似  C. 除非    D.直到。句意:他陷入了极大地麻烦,但是他表现得好像什么事都没有发生过。故选B。
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