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單項(xiàng)選擇題

The conclusion is（）the said ship is fit to continue to sail.

A.it
B.this
C.that
D.what

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單項(xiàng)選擇題

The burden of proving unseaworthiness is upon those who（）it.

A.approves
B.alleges
C.allows
D.permits

單項(xiàng)選擇題

The bottom of the mast rests on a part of the keel called the mast（）.

A.foot
B.heel
C.step
D.sole

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