________treesareplantedeachyearon

发布时间：2020-07-27 07:59:31

________ trees are planted each year on the Tree-Planting Day all over the country．A.Tens of thousandB.Tens of thousands ofC.Tens and thousandsD.Ten of thousands of

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B解析tens of thousands of“成千上万的”，A、C、D三种形式都是错误的，只有B正确．
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