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I think you should think twice .Once ______, the decision won’t be easily changed .
A.makingB.to be madeC.being madeD.made
D

试题分析:句意为:我认为,你应该三思。一旦作出了,决定便不容易改变。once为表条件的用法,引导的部分做状语,其逻辑主语是the decision,与make之间的关系是被动, 故应为done.表被动的含义,所以答案应为D。
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