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题目
题型:不详难度:来源:
Don’t promise anything ________ you are one hundred percent sure.
A.ifB.afterC.whenD.unless

答案
D
解析

试题分析:if是否,如果;after在……之后;when当……时;unless除非,如果不。句意:如果你不是百分之百的确定,不要承诺任何事情。故选D。
核心考点
试题【Don’t promise anything ________ you are one hundred percent sure.A.ifB.afterC.wh】;主要考察你对助动词等知识点的理解。[详细]
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