單項(xiàng)選擇題James Watt（）the steam engine.
A.was inventing
B.invented
C.had invented
D.has invented
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1.單項(xiàng)選擇題It is（）to interrupt the others while they are talking.
A.rough
B.rude
C.polite
D.troublesome
2.單項(xiàng)選擇題It was well known that Thomas Edison（）the electric lamp.
A.invented
B.discovered
C.found
D.developed
3.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
4.單項(xiàng)選擇題It was a great pleasure（）me to be invited to the party.
A.for
B.on
C.to
D.of
5.單項(xiàng)選擇題It is not always easy to tell the right（）the wrong.
A.from
B.with
C.than
D.to
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