来自李春林的问题
【初中英语疑难：有关不定式whichgroupwasthefirstonetosolvetheproblemwhichgroupwasthefirstonetosolvetheproblem?这里的为什么要用tosolve,而不用solved?】
初中英语疑难：有关不定式whichgroupwasthefirstonetosolvetheproblem
whichgroupwasthefirstonetosolvetheproblem?这里的为什么要用tosolve,而不用solved?
