He was in great trouble, but he acted _______ nothing had happened.
A．even ifB．a(chǎn)s ifC．unlessD．until
B
連詞辨析。A.即使  B.好似  C. 除非    D.直到。句意：他陷入了極大地麻煩，但是他表現(xiàn)得好像什么事都沒有發(fā)生過。故選B。
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