______ he has made up his mind, no one can make him change it.
A．Once B．UnlessC．Until D．As
A

試題分析：考查連詞辨析。A一旦；B除非，如果…不…；D直到…才；D因為；句意：一旦他下定決心，沒有人能讓他改變。故A正確。
點評：連詞的辨析要放在上下文中進行，特別注意unless=if…not如果…不;該詞是考試的重點。
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