--CanImakeanychanges?--Youcertainlycan________.A.whenyouarenecessaryB.whe

发布时间：2020-08-06 18:28:36

--Can I make any changes?--You certainly can ________.A.when you are necessaryB.when is necessaryC.if necessaryD.when it necessary

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C解析if necessary＝if(it is) necessary，类似的有when possible等．
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