Has it been warned that all the children in this area      stay at their homes until the Flu has been controlled ?

Has it been warned that all the children in this area      stay at their homes until the Flu has been controlled ?

A．can              B．will              C．may              D．shall

Has it been warned that all the children in this area      stay at their homes until the Flu has been controlled ?

1. A.
   can
2. B.
   will
3. C.
   may
4. D.
   shall

Has it been warned that all the children in this area ____ stay at their homes until the Flu has been controlled?

A． can        B．will         C．may         D．shall