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The man in black was about to set fire to the house ____ the police came.
A.whileB.afterC.beforeD.when
D
连词辨析。A. 当……是 ,强调另个动作同时发生; B. 在……之后 C. 在……之前  D. 当……时。句意:当警察进来时,这个穿黑衣的人正要给房子放火。动作发生有先后,故选D。
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