The environment will be further polluted unless some measures _____.A．are takenB_刷题宝

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The environment will be further polluted unless some measures _____.

A．are taken	B．will be taken
C．are being taken	D．should be taken

上一题下一题 0.64难度单项选择更新时间:2013-07-22 07:15:33

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