WE INTEND TO DO --- WITH THE OLD SYSTEM AS SOON AS WE HAVE DEVELOP...

46. - 2 DE THAM KHAO THI THU DAI HOC MON ANH VA DAP AN
Tiếng Anh 2 DE THAM KHAO THI THU DAI HOC MON ANH VA DAP AN

46.

We intend to do --- with the old system as soon as we have developed a better one.

A up

B away

C down

D in