____ he has made a decision, it is not easy for you to make him change his mind.
A．Though B．UnlessC．OnceD．Until
C
考查連詞辨析。一旦他作出決定你不容易讓他改變主意。A. Though 雖然  B. Unless 除非 C. Once  一旦          D. Until 直到 根據(jù)語(yǔ)境選C
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