Nobody knew what this guy ______ all these years.A、had been doingB、have being d

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问题 Nobody knew what this guy ______ all these years.

选项 A、had been doing
B、have being doing
C、was doing
D、has been doing

答案 A

解析过去完成进行时。过去完成进行时表示过去某一时间或动作之前某一延续的动作，其所表示的动作具有持续性、长期性和感情性。通常与表示一段的时间状语连用。译为“一直……”。

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