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用所给动词适当形式填空:On the night of the play,Jack was at the theater

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用所给动词适当形式填空:On the night of the play,Jack was at the theater early and he (1) already(1)(dress) in a policeman's clothes long before the end of the first scene.
这里有几个答案:A.have been dressed B.had been dressed C.was dressde
用所给动词适当形式填空:On the night of the play,Jack was at the theater
B
had already been dressed in
过去完成时.
首先全句整体是过去时,排除A.
然后看见 long before the end of the first scene.
表示在"第一场演出结束之前",演出是过去的,在此之前即"过去的过去",所以要用过去完成时.
短语be dressed in 穿着..