observe 意为 "观察 注意地看 仔细地看 "
常用结构为observe sb do sth / observe sb doing sth / observe that ...
在这题应该是用了第一个结构,句子中的lying on the sunny grass你可以把它当做一个修饰成分,主干部分是 I observed a large dog raise its ears,我看见一只大狗竖着它的耳朵
以上为个人理解 可能有误 你最好向老师求证一下哦
As I spoke I observed a large dog lying on the sunny grass b
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