— Is there any possible way to help the children get rid of such a bad habit?
— To be honest, it’s very hard, but we ______on this problem.
A.work B.worked C.are working D.were working
— Is there any possible way to help the children get rid of such a bad habit?
— To be honest, it’s very hard, but we ______on this problem.
A.work B.worked C.are working D.were working
C