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The last decade_______tremendous changes in the means of tra

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The last decade_______tremendous changes in the means of transportation.
A.has witnessed B.was witness C.witnessed D.is witnessed,
The last decade_______tremendous changes in the means of tra
答案是C
The last decade== PEOPLE - - - FROM 2000 TO 2010 / BETWEEN 2000 AND 2010.所以用一般过去时,不用现在完成时.记住,the last decade在这里是做主语,不是时间状语.in the last decade需要句子的谓语是has witnessed.又如:
The 1990s witnessed / saw a rapid development of the local economy in Shanghai.
==People saw / witnessed a rapid development of the local economy in Shanghai in the 1990s...记住,主语与时间状语不是同一个概念.