Large amounts of water __________ in the past five years.A．were pollutedB．was po

题干

Large amounts of water __________ in the past five years.

A．were polluted	B．was polluted
C．has been polluted	D．have been polluted

上一题下一题 0.65难度单项选择更新时间:2018-02-12 11:08:10

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