Who opened the door? –এর পরিবর্তিত voice হচ্ছে-
A. By whom was the door be opened?
B. By whom was the door opened?
C. By whom is he door opened?
D. By whom has the door opened?
সঠিক উত্তরঃ
B.
By whom was the door opened?
Explanation: Interrogative active sentence who দ্বারা শুরু হলে passive করার সময় তা by whom হয়ে যায় এবং এর পরে auxilary verb + Subject + Verb এর past participle + বাকি অংশ।