You are supposed to be here at 9 a.m, but it is 11 a.m now.

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
You are supposed to be here at 9 a.m, but it is 11 a.m now.
A. You needn't have been here two hours ago.
B. You must have been here two hours ago.
C. You should have been here two hours ago.
D. You oughtn't to have been here two hours ago.