25. My phone ______ have been stolen while I was taking a bus. I can't find it anywhere.
A
can
B
must
C
should
D
Would
根据题意，关键词是I can't find it anywhere，因为到处找不到所以手机一定被偷了。因此选情态动词must，Must have done表示对过去的猜测意思是“一定”故选B。
本题是语法知识题。本句意思是：我的手机______被偷了当我正在乘公交期间。我到处找不到它了。此处选B.
把握不准要点。