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______ he has made a decision, it is not easy for you to make him change his mind.
A．Though B．UnlessC．UntilD．Once
D

試題分析：連詞辨析。A盡管；B除非，如果…不…；C直到…才；D一旦；句意：一旦他做出了決定，對你來說讓他改變主意是很不容易的。根據(jù)句意說明D正確。
點評：對于連詞的辨析要放在上下文語境中進行，本題的B項是考查的重點，要注意unless可以換成if…not的結構。
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