Question

Has it been warned that all the children in this area_____

Has it been warned that all the children in this area_____stay at their homes until the Bird Flu has been controlled?
A.can
B.will
C.may
D.shall

麻烦再解释一下

Answer 1

B until引导的从句用现在时，主句应该用will+动词原形，不能用其它词

Answer 2

选D。表警告或者是命令。