單項(xiàng)選擇題

（）the time of collision，the 3rd officer was on the bridge．

A.At
B.On
C.Of
D.In

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單項(xiàng)選擇題

（）the ship leaves at 1000 today，she can arrive there tomorrow.

A.When
B.How
C.If
D.Should

單項(xiàng)選擇題

（）the packing is the same，the lots are different in marks.

A.For
B.Since
C.Because
D.Although