A.have found, from polluting |
B.have found, from being polluted |
C.have been found, from being polluted |
D.has been found, from being polluted |
A.work | B.have been working | C.worked | D.had been working |
A.are being trained | B.are training | C.will train | D.will be trained |
A.have bought | B.bought | C.had bought | D.would buy |
A.is taking | B.was taking | C.took | D.had taken |
A.called for | B.are calling for | C.have called for | D.will call for |
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