We now know the first dinosaurs ___ [apper]about 230 million years ago.

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• 英语翻译I read some amazing things about today.Dinosaurs lived on Earth a long time ago.we now know that the first dinosaurs apperared about 230 million years ago.however,scientists believe they were not the first animals on Earth.there were hundreds of different kinds of dinosaurs ,but they didn't live at the same time.some dinosaurs were really smally.……
• We now know the first dinosaurs ___ [apper]about 230 million years ago.
• We now know the first dinosaurs_____(出现)about 230 million years ago.
• We now know the first dinosaurs_____(出现)about 230 million years ago.
• We now know the first dinosaurs ___ [apper]about 230 million years ago.
• 请问“Who was the car invented by?”和“Whom was the car invented by?”那一种说法正确?好像两种说法都可以，还是？
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