请教两道填空题，来自PP2第二套~

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The spy’s repeated bungling was, above all else, ______ those who wished to thwart her efforts, since it was so unpredictable as to obscure any pattern that might otherwise lead to her capture.  
(A) an obstacle to
(B) a signal to
(C) a hindrance to
(D) an indication for
(E) a snare for
(F) a boon to
答案AC, obsure any pattern...那句是什么意思啊？之前说这个spy行动笨拙，为什么还阻止了那些阻止他努力的人。。。

The detective’s conviction that there were few inept crimes in her district led her to
impute some degree of ______ to every suspect she studied.
(A) deceit
(B) acumen
(C) duplicity
(D) shrewdness
(E) evasiveness
(F) equivocation
答案BD，这句话是说，她把没有低级的犯罪归因于她所研究的嫌疑犯都很精明？
求指教~

toyourkingdomUID：3466355

alexl39 发表于 2013-9-1 23:14
论坛都有人问过了，自己搜一下？

第一个没搜到，第二个有人问过，但是没有解答TT

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alexl39 发表于 2013-9-2 00:02
“之前说这个spy行动笨拙，为什么还阻止了那些阻止他努力的人？"
-- since it was so unpredictable as  ...

thanks~那这句obscure any pattern that might otherwise lead to her capture是什么意思呢。。。