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It is written clearly in the requirements that all passengers _______ check onto board thirty minutes before the plane takes off.

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

It is written clearly in the requirements that all passengers _______ check onto board thirty minutes before the plane takes off．

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

It is written clearly in the requirements that all passengers _______ check onto board thirty minutes before the plane takes off．

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

It is written clearly in the requirements that all passengers        check onto board thirty minutes before the plane takes off.

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

It is written clearly in the requirements that all passengers        check onto board thirty minutes before the plane takes off.

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