Although many measures _____, the world’s economy is still going down.
A．a(chǎn)re taken B．were taken
C．will be taken D．have been taken
D
考查時(shí)態(tài)。根據(jù)句意可知：結(jié)構(gòu)很多措施已經(jīng)被采取，世界經(jīng)濟(jì)仍然在下滑。可知這里應(yīng)該使用現(xiàn)在完成時(shí)的被動(dòng)形式。
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