问题
选择题
Although many measures _____, the world’s economy is still going down.
A．are taken
B．were taken
C．will be taken
D．have been taken
答案
答案：D
考查时态。根据句意可知：结构很多措施已经被采取，世界经济仍然在下滑。可知这里应该使用现在完成时的被动形式。
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