问题描述：
时间短语前为什么加介词
it has belonged to my family for a long time和the intrument was bought by my father many years ago 中 为什么第一句加FOR?不加可以不?改写为：it has belonged to my family many years 谢谢
it has belonged to my family for a long time和the intrument was bought by my father many years ago 中 为什么第一句加FOR?不加可以不?改写为：it has belonged to my family many years 谢谢
问题解答：
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