Liu Yu,a good runner is serious about running.为什么用about,而不是in1楼哒偶觉得还系不够说服力饿.

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Liu Yu,a good runner is serious about running.为什么用about,而不是in1楼哒偶觉得还系不够说服力饿.

Liu Yu,a good runner is serious about running.为什么用about,而不是in1楼哒偶觉得还系不够说服力饿.
Liu Yu,a good runner is serious about running.为什么用about,而不是in
1楼哒偶觉得还系不够说服力饿.

Liu Yu,a good runner is serious about running.为什么用about,而不是in1楼哒偶觉得还系不够说服力饿.
初三上的Reading 吧 我们刚学过不久````be serious about 是固定搭配````没什么异议` 而且`没有 be serious in

running是动名词结构,做介词about的宾语,况且be serious about是个固定英语搭配:意为认真对待...,对某人某事是严肃的,认真的。所以不能用in。
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