we all know that the first diosaurs a____ about 230 millionyears ago.

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we all know that the first diosaurs a____ about 230 millionyears ago.
we all know that the first diosaurs a____ about 230 millionyears ago.

we all know that the first diosaurs a____ about 230 millionyears ago.
appeared 出现

appeared出现
我们都知道第一只恐龙出现在230,000,000年前

appeared 出现