The examination .... before I reached the hall.
A
has started
B
did start
C
had started
D
had been started
Correct Answer: had started
Before conjunction দ্বারা দুটি clause যুক্ত হলে একটি past tense - এ আর অপর clause টি past perfect tense - এ হবে । সুতরাং সঠিক expression টি হলো had started ।