three quarters of the forest _ cvered with trees of broad leaves while the rest_ pine trees 填be动说明原因

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three quarters of the forest _ cvered with trees of broad leaves while the rest_ pine trees 填be动说明原因

three quarters of the forest _ cvered with trees of broad leaves while the rest_ pine trees 填be动说明原因
three quarters of the forest _ cvered with trees of broad leaves while the rest_ pine trees 填be动
说明原因

three quarters of the forest _ cvered with trees of broad leaves while the rest_ pine trees 填be动说明原因
three quarters of the forest( is )covered with trees of broad leaves while the rest(is)pine trees .
整句话的意思:森林的四分之三是阔叶林(,剩下的(四分之一)是松树林.
这里主语是forest(森林),因此用单数.也就是说把森林看作是一个整体,分成两部分,一部分是阔叶林(单数),一部分是松树林(单数).