Thank you for all your hard work last week,I do not think we--it without you a,can manage b,could have managed c,could manage d,can have managed选什么?为什么?

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Thankyouforallyourhardworklastweek,Idonotthinkwe--itwithoutyoua,canmanageb,couldhavemanagedc,couldma

Thank you for all your hard work last week,I do not think we--it without you a,can manage b,could have managed c,could manage d,can have managed选什么?为什么?
Thank you for all your hard work last week,I do not think we--it without you
a,can manage
b,could have managed
c,could manage
d,can have managed
选什么?为什么?

Thank you for all your hard work last week,I do not think we--it without you a,can manage b,could have managed c,could manage d,can have managed选什么?为什么?
选B could have done 表示过去的虚拟语气的用法

b

b 虚拟语气,本不可能,建议你看看语法书

B.这是对过去的一个虚拟语气,动作发生在过去且已完成