It has been announced that passengers __________ open their seatbelts until the plane has landed．

1. A.
   mustn’t
2. B.
   won’t
3. C.
   needn’t
4. D.
   mightn’t

广西南宁市2011年高中毕业班第二次适应性测试

It has been announced that passengers           open their seatbelts until the plane has landed.

       A．mustn’t               B．won’t                  C．needn’t               D．might not