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

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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
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!

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

1. in working out
2. the second time

to work out
the second time

to work out
the second time

1.in working out
2.the second time

to work out
the second time