I want a policeman because it is an exciting .A. doing, jobB. doing, workC. to be, workD.

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A. doing, job
B. doing, work
C. to be, work
(答案→)D. to be, job
解析：根据want to do的用法，我们可以排除AB；根据an我们可以排除C，因为work是不可数名词，而job是可数名词。所以本题选D。