摘要： The place you are going to visit is the ruin of a place. A. in which B. at which C. where D. which 28. The factory I am going to is the place my mother used to work many years ago. A. where, where B. where, which C. which, where D. that, which 29. Don’t do such things you are not sure about. A. that B. which C. as D. what 30. Rober is good at language, we all know. A. because B. for C. as D. since

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