This is just ten years after it ___ fivebillion.A.reach B.reached C.got D.get 选什么?为什么?

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Thisisjusttenyearsafterit___fivebillion.A.reachB.reachedC.gotD.get选什么?为什么?Thisisjusttenyearsafterit_

This is just ten years after it ___ fivebillion.A.reach B.reached C.got D.get 选什么?为什么?
This is just ten years after it ___ fivebillion.
A.reach B.reached C.got D.get
选什么?为什么?

This is just ten years after it ___ fivebillion.A.reach B.reached C.got D.get 选什么?为什么?
This is just ten years after it _B.reached __ five billion
it is /this is +一段时间+after+一般过去时 . 意思是,过了多久才干什么.

B
到达某个水平 ,应该用reach ,十年前到达所以用过去式。