单选题 Nancy had (a great deal) of trouble (to concentrate on) her work (because of) the noise (in) the next room.
  • A. a great deal of
  • B. to concentrate on
  • C. because of
  • D. in


【正确答案】 B
【答案解析】应改为concentrating on。have trouble doing sth．做……很困难，固定用法。