Question

I really don't know how to thank you, but for your help, I ________ my lost necklace.

A．couldn't have found B．mustn't have found

C．couldn't find D．wouldn't find

 

Answer 1

A

【解析】A　句意：我真的不知道该怎样感谢你，没有你的帮助，我不可能找到我丢失的项链。couldn't have done表示对过去情况的否定推测，意为“不可能”。