情态动词表推测的用法 — 英语词汇题
题目
根据语境，用 must、may 或 can’t 填空。A sealed bottle was found inside a locked, dry cupboard. The cupboard had no opening except its locked door, and the bottle was dry before it was put there. The door has not been opened since. The bottle ______ have been placed in the cupboard before the door was locked.