提问一个英语单选()global psitioning technology ,the United States carried out a study in 1999 that clainmed Everest peaks at 8850,mA,using B To use C used D Havig used

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提问一个英语单选()global psitioning technology ,the United States carried out a study in 1999 that clainmed Everest peaks at 8850,mA,using B To use C used D Havig used
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提问一个英语单选()global psitioning technology ,the United States carried out a study in 1999 that clainmed Everest peaks at 8850,mA,using B To use C used D Havig used
提问一个英语单选
()global psitioning technology ,the United States carried out a study in 1999 that clainmed Everest peaks at 8850,m
A,using B To use C used D Havig used

提问一个英语单选()global psitioning technology ,the United States carried out a study in 1999 that clainmed Everest peaks at 8850,mA,using B To use C used D Havig used
选A.
using 是现在分词做伴随状语.
通过运用全球定位技术,美国实施了一项研究,这项研究宣称珠穆朗玛峰高8850米.

根据句意选D。

选 D啊! 从语法上来解是指USA在1999年之前都在用这个全球定位技术。