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问个英语语法问题
In 2009,basic and applied research spending constituted 4.7% and 12.6% of total R&D expenditure,dropping from 2000 levels of 5.2% and 17%,respectively.
这里的dropping作什么成分啊?
人气:122 ℃ 时间:2020-02-05 08:13:25
解答
现在分词短语,做伴随状语.
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