There are so many tall trees in the forest,__ A some of whic

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There are so many tall trees in the forest,__ A some of which measures50 metres
B some of which measuring 50 metres

答案：A some of which measure 50 meters.
翻译：这森林里有如此多的高数,有一些高达50米.
句中用逗号隔开,其后又没有并列连词and等连接,说明后半部分为非限制性定语从句.
关系代词代指先行词trees,在定语从句中充当of的宾语.
其中,measures为定语从句的谓语动词,意思是“度量为...”,所以不能选用答案B,因为measuring不能单独做句子的谓语.
即：some of (which) measure 50 metres
= some of (the tall trees) measure 50 metres
注：是不是楼主打错了答案A,其中的谓语动词meausre不能使用单三形式,因为该定语从句的主语some of which表复数概念.
再问：没打错
再答：那答案CD为什么不打出来？正确答案可以是：some of which measure 50 meters 或 some of them measuring 50 meters 其中，前者使用非限制性定语从句，后者使用独立主格结构。
再问：有一个答案是some of them measuring 50 ，令一个答案不对
再答：正确答案一定是some of them measuring 50 meters了！题目很难哦，连独立主格结构都考出来了。
再问： some of which measuring 50 meters不对吗前面有逗号，不是不能用them吗？
再答：如果使用which，表明它是非限制性定语从句，而measuring是不能单独做从句/句子的谓语的。你说 I doing my homework 这样的句子对吗？ some of them measuring 50 meters是独立主格结构，该结构在句中充当状语，且一般都用逗号和句子其他成分隔开，some of them是measuring的逻辑主语，必须使用them. 独立主格结构的语法很复杂，建议楼主可以自行搜索，三言两语是无法解释清楚的。

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