mr johnson has been a teacher for twenty years保持基本句意不变mr johnson＿a teacher twenty years＿两个下划线是空多谢了

题目

mr johnson has been a teacher for twenty years保持基本句意不变mr johnson＿a teacher twenty years＿两个下划线是空多谢了

答案

mr johnson has been a teacher for twenty years保持基本句意不变Mr johnso [became ]a teacher twenty years[ago.]

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