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IcouldsendE-cardsbeforehavingthecomputerlesson.IcouldsendE-cardsbeforehavingthecomputerlesson.在学计算机课之前我就会发送电子贺卡.请问,问中的having

题目详情
I could send E-cards before having the computer lesson.
I could send E-cards before having the computer lesson.在学计算机课之前我就会发送电子贺卡.
请问,问中的having
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答案和解析
因为before是介词,介词后面要用动名词,所以have才会变成having,是have lesson是在一起的,上课的意思.不知道这样说你能理解吗!