问题
选择题
—What caused the accident?
—It was my fault, sir. I _____ to the left.
A．ought not to have turned
B．needn’t have turned
C．shouldn’t turn
D．couldn’t turn
答案
A
本题的语意环境为：是我导致了这场事故，我本不该向左拐。ought not have done="shouldn’t" have done本不该做某事；needn’t have done：本来没有必要做某事而做了。故选A。