We have Abeen told that under Bno circumstances Cwe may use the telephone in the office Df

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We have Abeen told that under Bno circumstances Cwe may use the telephone in the office Dfor personal affairs.

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗