问题补充:
Had it not been for the police’s help, Peter his bicycle yesterday afternoon.
A. could not find
B. could not have found
C. didn’t find
D. hadn’t found
答案:
A. could not find
(答案→)B. could not have found
C. didn’t find
D. hadn’t found
解析:本句是if引导的虚拟条件句的省略,Had it not been for the police’s help=If Peter hadn’t got the police’s help。从yesterday afternoon可知是与过去相反,主句使用would/could/should/might+have done,故选B答案。句意:要不是警察的帮助,彼得昨天下午不可能找到他的自行车.