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

试题分析:考查连词辨析。A一旦;B除非,如果…不…;D直到…才;D因为;句意:一旦他下定决心,没有人能让他改变。故A正确。
点评:连词的辨析要放在上下文中进行,特别注意unless=if…not如果…不;该词是考试的重点。
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