Nobody knew what this guy ______ all these years.

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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…"。[例句] He told me that he had been sitting at the gate for 2 hours．他告诉我他一直在门口坐了两个小时了。

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本试题收录于：大学英语三级A级题库大学英语三级分类