China has changed a lot _____ these years填 in 还是 for

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China has changed a lot _____ these years填 in 还是 for
China has changed a lot _____ these years
填 in 还是 for

China has changed a lot _____ these years填 in 还是 for
in和for 后面都可以接名词（年份,月数,天数）但在具体的问题中要看问题针对的是什么.再你问的这个问题中先不管是in还是for,整个句子的意思你应该猜的到,它是说中国在这些年内变化很大,而in强调的在么个时间段“内”或距离“内”,正好符合原句的意思.for一般强调为么么做些什么.所以具体问题中看它针对的是什么.

但for后面也是有加时间段的，
i have worked here for three years
但你这里，应该不是用for的

in
中国在这些年有许多变化什么时候用for啊？虽然说for作为介词,它后面可以接名字.. 但是.for的后面应该加上原因..或者表示为了 do sth for sb,为了某人做某事 thank sb for sth 为某事谢谢某人 Thank you for these years' help 感谢你这么多年的帮助可for后面也有接时间的呀向现在完成时中有很多55555，反正...

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in
中国在这些年有许多变化

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