Please choose the correct answer to fill in the blank.
Lǐ Huá: Wŏ fàng zài zhuō shàng de niúnăi ne?
李 华：我 放 在 桌 上 的 牛奶 呢？
Li Hua: Where is the milk that I put on the desk?
Judy: Yídìng shì _____Jack hē le.
Judy：一定 是_____ Jack 喝 了。
Judy: It must have been drunk by Jack.
A. 把(bǎ)
B. 被(bèi)