The orator 'had been left' the auditorium before the audience stood up.
A
had been left
B
was left
C
had left
D
no improvement
Correct Answer: had left
The orator অর্থ্যাৎ subject নিজেই auditorium ত্যাগ করে ছিলেন বলে verb - এর active form হবে। সুতরাং সঠিক উত্তর (c) had left হবে।