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單項(xiàng)選擇題

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

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

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單項(xiàng)選擇題

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

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

單項(xiàng)選擇題

It was in（）the American astronauts succeeded in landing on the moon.

A.when
B.the moment
C.which
D.that

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