单选题 Many doctors have become ______ with the possible long-term effects of birth control pills.
  • A. sensible
  • B. anxious
  • C. aware
  • D. concerned
【正确答案】 D
【答案解析】concern with“关注”。本题考查近义词辨析和搭配，其余几个选项都不与with搭配。