单选题 Tom didn't go to the Great Wall with us last Sunday because he ______ there three times.
  • A. was
  • B. had been
  • C. has been
  • D. were
【正确答案】 B
【答案解析】[解析] 此题测试时态的用法。Tom上星期六没有去长城(过去时didn't go)，因为他已经去过三次，过去的过去，应该用过去完成时。因此，答案是B)。