题目内容

一些用户对手机实名制打击犯罪能起到多大的效果表示怀疑。如果不法分子______地想骗人，就肯定会想办法找出漏洞避开监管。填入划横线部分最恰当的一项是( )。

A. 殚精竭虑
B. 处心积虑
C. 苦心孤诣
D. 不遗余力

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