Our teachers often ask us ______ over the answers carefully before handing in our papers.

Our teachers often ask us ______ over the answers carefully before handing in our papers.

A．go               B．going             C．to go             D．gone

Our teachers often ask us ______ over the answers carefully before handing in our papers.

1. A.
   go
2. B.
   going
3. C.
   to go
4. D.
   gone