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A great number of tall buildings ____in Beijing in the past

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A great number of tall buildings ____in Beijing in the past few years.
A have set up B has set up C have been set up
D has been set up
A great number of tall buildings ____in Beijing in the past
C 答案对啊,
因为in the past few years是现在完成时的时间,时态应该用现在完成时
a great number of 的意思是许多的
所以助词要用复数.再有高的建筑物是被人建起来所以用be set up 总而言之要现在完成时的被动语态