The flowers in my room every day or they’ll die.A. must waterB. must be wateredC. should

问题补充：

The flowers in my room every day, or they’ll die.

A. must water

B. must be watered

C. should water

D. can be watered

答案：

A. must water

(答案→)B. must be watered

C. should water

D. can be watered

解析：句意：我房间里的花必须要每天都浇水，否则他们会死的。主语flower和谓语动词water构成了逻辑上的动宾关系，所以应该用被动语态，而情态动词must强调了浇水的必要性，故选B。