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單項(xiàng)選擇題

You must（）in this area unless you have messages about the casualty.

A.keep radio silence
B.keep radio silent
C.keep radio be silent
D.keep silent the radio

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You shall（）this letter so as to signify your acknowledgement of the responsibility.

A.make out
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D.endorse

單項(xiàng)選擇題

You should not divide the fresh water（）three trips.

A.in
B.into
C.to
D.for

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