We were amazed to watch fire break out on the surface of the sea.这里是break out还是broke out?

We were amazed to watch fire break out on the surface of the sea.这里是break out还是broke out?

题目
We were amazed to watch fire break out on the surface of the sea.这里是break out还是broke out?
这里是break out还是broke out?
答案
是break out,
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