◎ 题干
Mr. Obama paid a visit to China in November, 2009, _______, needless to say, must strengthen the Sino-US ties.
A.whatB.thatC.whichD.it
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Mr. Obama paid a visit to China in November, 2009, _______, needless to say, must strengthen the Sino-US ties.A.whatB.thatC.whichD.it…”主要考查了你对  【限制性定语从句】【非限制性定语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。