没有buy doing这个词组。buy=买 应该是by 后面不用加doing eg:The door close by the teacher. She sit by the window.
没有。
不过有by doing sth.的用法。
He responded by saying that he had no idea.
没有，应该是be busy doing吧，忙于做某事
没有。buy sb. sth.或者buy sth. for sb.
是不是by doing 呀
通过做。。。
by 是介词
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