what do you think__to protect our environment in the past few year?A to do B was done C has been done D have done

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whatdoyouthink__toprotectourenvironmentinthepastfewyear?AtodoBwasdoneChasbeendoneDhavedonewhatdoyout

what do you think__to protect our environment in the past few year?A to do B was done C has been done D have done
what do you think__to protect our environment in the past few year?
A to do B was done C has been done D have done

what do you think__to protect our environment in the past few year?A to do B was done C has been done D have done
选择 C
应该是一个现在完成时,并且应该用被动语态