單項選擇題It was essential that the application forms（）back before the deadline.
A.must be sent
B.be sent
C.would be sent
D.were sent
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A.to be
B.being
C.having been
D.to have been
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A.not going
B.not having been going
C.not to go
D.not to be going
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Shipboard Emergency Drills must be carried out at least（）on board cargo ship.
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