单选题 Academic papers are often part of a university's official file and can neither be returned to students nor duplicated.
  • A. borrowed
  • B. copied
  • C. purchased
  • D. destroyed


【正确答案】 B
【答案解析】[解析] duplicate和copy都表示“复印、复制”；borrow：借入、借用；purchase：购买、购置；destroy：破坏、毁坏、消灭、摧毁。