题目内容：
What's the policeman's biggest headache? __________
A．A He has to justify his arrests while unable to provide sufficient evidence in most case B．B He has to provide the best possible public service at the least possible expens
C．C lie has to get the most desirable results without breaking the law in any wa
D．D He can hardly find enough time to learn criminal law while burdened with numerouscriminal case
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