题目内容：

ive minutes earlier,and we () the last trade.
A.could have caught
B.could catch
C.should have caught
D.should catch
Five minutes…,…last train.之前写错了.

优质解答

是虚拟语气.
could have done 本来能够做某事实际上没做.而should have done 是本来应该做某事而没做.在这里不是应该能赶上而是只要早五分钟就"能"赶上最后一班火车,所以要选A.