Question

My MP4 player isn't in my bag. Where ________ I have put it?

1. A.
   can
2. B.
   must
3. C.
   should
4. D.
   would

Answer 1

A
本题考查情态动词。由句意"我的MP4不在我包里。我可能把它放哪儿了"？可知应选A。can have done"过去可能做过"。而must have done"过去肯定做过"，只能用于肯定陈述句；should have done"本应该做过 (而事实上没做) "；would have done只能用于虚拟语气。