The scientist has ______ the behavior of birds all his life.A、noticedB、seenC、n

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问题 The scientist has ______ the behavior of birds all his life.

选项 A、noticed
B、seen
C、notified
D、observed

答案 D

解析 observe vt.观察，注意到，察觉到；说，评论；遵守，奉行。

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