I can’t find my socks. Where I have dropped them?A. mustB. canC. wouldD. should

问题补充：

I can’t find my socks. Where I have dropped them?

A. must

B. can

C. would

D. should

答案：

A. must

(答案→)B. can

C. would

D. should

解析：此处must必须，一定；can可能； would会，过去常常；should应该。此处是can have done的形式，表示对过去发生事实的推测。故选B。句意：我找不到我的袜子。我可能把它们放哪里了呢？can 表推测用于疑问句和否定句。