An ambulance is waiting in the street. Someone should have been hurt or killed.
An ambulance is waiting in the street. Someone should have been hurt or killed.
【正确答案】:should改为must。
【题目解析】:本题考查情态动词。should意为”应该“,确定性比must小一些;而must意为”一定“,非常确定。根据句意,街上有一辆救护车,一定是有人受伤了,所以应该用must。
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