I have been more than six years old when the accident happened. A．shouldn’t B．co

I________have been more than six years old when the accident happened.

A．shouldn’t B．couldn’t　 C．mustn’t 　D．needn’t

试题答案

B

must表示推测时，只能用于肯定句，否定句中用can或could代替。shouldn’t have done表示“本来不该做某事，而实际上却做了”。needn’t have done表示“本来不必做某事，而实际上却做了”