Question

【题目】---The zookeeper was really annoyed with me.

--- How could he have been if you _______ stones at the animals?

A．didn’t throw

B．don’t throw

C．hadn’t thrown

D．haven’t thrown

Answer 1

【答案】C

【解析】此题考虚拟语气。第一句动物管理员生气是在过去，所以用石头扔动物必然也是在过去，且在从句中，故应该用had done,此题答案为C。