I simply couldn't understand how it ______ that you did so much work with such a short time.A.came about B.came back C.came up D.came along选A.原因?

I simply couldn't understand how it ______ that you did so much work with such a short time.A.came about B.came back C.came up D.came along选A.原因?
I simply couldn't understand how it ______ that you did so much work with such a short time.
A.came about B.came back C.came up D.came along
选A.原因?

I simply couldn't understand how it ______ that you did so much work with such a short time.A.came about B.came back C.came up D.came along选A.原因?
come about是发生的意思.句意为我只是不能明白你怎么能在这么短的时间内做这么多的工作

看意思。
A 发生B回来C出现D随着