I think you should complain—_________ , of course, you are happy with the way things are.
A．ifB．untilC．unlessD．once
C

試題分析：此處if如果；until直到……才； unless除非；once一旦。句意：我認為你應(yīng)該抱怨，除非你對事情感到滿意。根據(jù)句意選C。
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