为什么不选D over a very large number of trails,the probability of
为什么不选D over a very large number of trails,the probability of an event_____is equal to the probability that it will not occur. A.occuring B.to occur C.occurs D.occured
答案是 A the probability of an event (occur),这里是说 一个事件发生的可能性 * is equal to ** 如果前面这里也有一个that,就像后半句一样,那么就应该选occurs,但是没有,所以这里的动词occur应该是使它成为一个非谓语成分,所以应该是ing 形式或者ed形式,而这里 event和occur之间是主谓关系,所以是i...