D：词根rect有改正的意思,ify,就是什么化的意思,按字根意思说是正确地转化情况
A:simple词根好像是sym 相同的意思,加ify就相同化,跟题意不合,因为他叫你解决问题而不是叫你同化问题
B:修改的意思不符合
C：ver反转的意思,即反转检验,又不验尸,干嘛要反转.
所以,我觉得D
if you know what the trouble is,why don't you help them to _
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