A.The mine workers demanded that there should be breaks for food.B.The mine owners had

外语类 公共英语 已帮助 人

A.The mine workers demanded that there should be breaks for food.

B.The mine owners had to improve conditions and introduce safety measures.

C.The Combination Laws were brought into effect to help the mine owners.

D.The mine unions made it illegal to use children in coal mines.

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热搜:a是b的充分条件,b是a的必要条件吗