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单选题
5.By the time Alice returned home from America, her sonfrom university.
A
A. had graduated
B
B. has graduated
C
C. had been graduating
D
D. graduated
答案解析
正确答案：A
解析：
5.【翻译】 到爱丽丝从美国回到家时，她的儿子已经大学毕业了【精析】A by the time意为“到……时候（为it）",-般用来引导时间状语从句如果从句用一般过去时，那么主句 通常用过去完成时，表示“截止到从句动作（表示过去）发生时，主句动作已经完成”或“主句动作持续到从句动作（表 示过去）发生之前”，即动作发生在“过去的过去”根据从句中的returned可知，主句应用过去完成时，即主句谓语动 词用“had +过去分词”的形式。故选A：
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