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單項選擇題

0ur jumbo boom（）out of use for a long time.

A.is
B.will be
C.have been
D.has been

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單項選擇題

0ur jumbo boom can（）20 tons.

A.lift
B.rise
C.elevate
D.hoist

單項選擇題

0ur ship（）with many modern navigational instruments.

A.equipped
B.is equipped
C.equips
D.has equipped

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