I think it's going to be a big problem .Yes,it would be.I wonder( )we cando about itA.if B.how C.what D.that

I think it's going to be a big problem .Yes,it would be.I wonder( )we cando about it
A.if B.how C.what D.that

if .

A我认为那将是个大问题。是的，你想知道是否我们能做些什么。