单项选择题

The boss broke his rule against singing last night.

A.昨晚老板打破惯例,唱了点。
B.老板昨晚破例唱了歌。
C.老板昨晚破例没唱歌。
D.昨晚老板破了唱歌的禁令。
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单项选择题
Metal,iron in particular,is known to be an important material in building.
A.大家知道,金属,特别是铁,已知在建筑上是一种重要材料。
B.大家知道,金属,特别是铁,是建筑方面的重要材料。
C.金属,铁很特殊,是重要建筑方面的材料。
D.金属,尤其是铁,它是建筑中的重要材料,这是众所周知的。
单项选择题
Since the introduction of the new technique,the production cost______greatly.
A.reduces
B.is reduced
C.is reducing
D.has been redused
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