[ Grammar ]
We also have an evacuation plan _______ we need to get everyone off the rig quickly.
A. when
B. if
C. unless
D. in case
Select your answer:
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A. is
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Which of the following sentences is a command?
A. You must go home quickly now.
B. It is necessary to close the library.
C. Tidy the chairs before you leave.
D. They should catch the next bus.