一道选择题（定语从句）
--Have the police caught the thieves__the bank last week?
--Yes,they were caught yesterday.
A.that robbed B.which robbed
C.robbed D.who have robbed
应该选什么?为什么?谢谢
参考答案:A 抢银行的时间是last week 上星期，用过去时robbed ,定语从句的先行词是 thieves (人) ， 丛属连词可用who/that