来源：学生作业帮 编辑：拍题作业网作业帮 分类：英语作业 时间：2024/04/18 20:04:37
两道英语题,希望快点告诉答案!
1 His son had much difficultly ______ _______ _______ the problem.他儿子很难解出这道题.
2 This is ______ ________ ________ that he has visited China. 这是他第二次访问中国. 急求!谢谢!
in working out
the second time
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