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單項(xiàng)選擇題

（）during the voyage any case or suspected case of plague，cholera，yellow fever，smallpox，typhus or relapsing fever?

A.Has there been
B.Have there been
C.Has there
D.Have there

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單項(xiàng)選擇題

（）day，pilot flag should be displayed from main mast.

A.From
B.By
C.on
D.With

單項(xiàng)選擇題

（）any sick person on board now apart from the above-mentioned cases?

A.Have
B.Has
C.Is there
D.Are there