求助英语大神 一道英语选择题!
34.Inmanycountriesthelawforbidscitizenstocarrypistolsorrifleswithoutfirst___D___aspec...
34. In many countries the law forbids citizens to carry pistols or rifles without first ___D___ a special permit. A) obtaining B) to obtain C) being obtained D) having obtained 答案为D,请解释一下为什么!!!
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