______ he has made up his mind, no one can make him change it.
A．UnlessB．OnceC．UntilD．As
B

試題分析：考查連詞辨析。A除非；B一旦；C直到…才；D當…時；句意：一旦他下定了決心，就沒有人能讓他改變。故B正確。
點評：連詞的辨析也要放在上下文中進行，要注意unless用法，要把它改成if…not…便于理解。
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