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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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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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

what do you do? “what do you do! What do you do? what do you do Love what you do,do what you what are you what do you do? What do you do at what do you do after what do you do ( ) christmas? what do you do every What do you do every What do you do是什么意思 What chores do you do what do you do on what do you do,exactly? 英译汉 what do you do? what do you do there? What do you do there?