Since the Obama administration took office, the China—US relations ________ positive development thanks to joint efforts of both sides, President Hu said at the -高中英语-n多题

◎ 题干

Since the Obama administration took office, the China—US relations ________ positive development thanks to joint efforts of both sides, President Hu said at the Nuclear Security Summit in Washington, April,12,2010.

A．witnessed

B．were witnessed

C．had witnessed

D．have witnessed

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◎ 解析

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◎ 知识点

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