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is oFtEn oCCur的用法

不能用is often occur 经常发生 双语例句 1 Food shortages often occur in time of war. 在战争期间常常发生粮食短缺的情形。 2 Frosts often occur in November. 11月份经常出现霜冻。

Of course 3/7 is the correct answer.

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