It is written clearly in the requirements that all passengers ______ check onto board 30 minutes before the plane takes off.

It is written clearly in the requirements that all passengers ______ check onto board 30 minutes before the plane takes off.

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

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D

requirements当要求讲,后面的同位语从句that all passengers ______ check onto board 30 minutes before the plane takes off.应该用(should)+do的虚拟语气

1年前

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