單項選擇題

James Watt（）the steam engine.

A.was inventing
B.invented
C.had invented
D.has invented

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單項選擇題

It is（）to interrupt the others while they are talking.

A.rough
B.rude
C.polite
D.troublesome

單項選擇題

It was well known that Thomas Edison（）the electric lamp.

A.invented
B.discovered
C.found
D.developed

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