The problem __________, they went home. being solved B. has been _英语解答

The problem __________, they went home. being solved B. has been solved C. been solved D. has to be
The problem __________, they went home.
being solvedB. has been solvedC. been solvedD. has to be solved
求详细解答啊.

人气：466 ℃　时间：2019-10-14 03:56:49

解答

being solved
The problem _being solved_(这是独立主格结构作状语表示时间）,they went home.
=When the problem was solved,they went home