题目内容
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
提示:
提示:
|
shall用于陈述句的第二、三人称时,表示说话人的意图、允诺、警告、命令、决心等,意思是“必须,应该”。 |
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