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The Chinese mainland pandas ,Tuan Tuan and Yuan Yuan,____to

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The Chinese mainland pandas ,Tuan Tuan and Yuan Yuan,____to Taiwan on Dec.23rd ,2008 .
A sent B had sent C were sending D were sent
The Chinese mainland pandas ,Tuan Tuan and Yuan Yuan,____to
D.were sent
这里是指“被送到”台湾.所以要用被动式!题目中就只有D是被动式
再问: 开始我也是这么想的 但是大难是 b
再答: 那你确定没打错吗? B的话,应该是“had been sent”