many forms of life___ectinct many years ago.A became B died C had to D used to

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manyformsoflife___ectinctmanyyearsago.AbecameBdiedChadtoDusedtomanyformsoflife___ectinctmanyyearsago

many forms of life___ectinct many years ago.A became B died C had to D used to
many forms of life___ectinct many years ago.A became B died C had to D used to

many forms of life___ectinct many years ago.A became B died C had to D used to
选A 意思是 很多生活方式在很多年以前就 消失了
exctinct 在这里是形容词 可以用became 来修饰 表示一个动作的的发生过程