A.Because there was a shortage of men and women in the area.B.Because mining communiti

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A.Because there was a shortage of men and women in the area.

B.Because mining communities were then separated from the rest of the country.

C.Because the mining tunnels were too low for the horses to pull trucks of coal through.

D.Because the mine owners were unable to make men and women work longer hours and stay down the mine all day.

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热搜:a是b的充分条件,b是a的必要条件吗