be busy with sth.spend on sth.be busy doing sth.spend doing sth.keep on dong sth mind doing sth这一些总称什么,这些东西是规定的吗?介词也是吗?如果是规定的有规律吗?难道要死记
人气：212 ℃ 时间：2020-05-29 12:46:08
解答
都是固定搭配的亲~一般都是doing sth 或者是to do sth ,没有规律,所以是要记的,记下来了之后就会轻松很多了,
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