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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

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單項選擇題

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

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

單項選擇題

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

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