问题
选择题
.
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
答案
答案：D
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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
答案：D