题目内容
In our city, one third of the area________covered with green trees, but only forty percent of them ________ well looked after.
A.is; have B.is; are C.has; are
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题目内容
In our city, one third of the area________covered with green trees, but only forty percent of them ________ well looked after.
A.is; have B.is; are C.has; are