The earthquake was lasted only 30 seconds,but caused great damages to the half city.

去掉was；damages→damage；the half→half the


解析:

lasted是不及物動詞，意為“持續(xù)”；damage表示“損失；損害，損壞”是不可數(shù)名詞；half與名詞連時，中間需要加冠詞。

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