that that还是what what请看下面一道题:His lecture was difficult and I didn’t know _________ he said meant in his lecture.A. that B. whatC. that that D. what what许多同学一看选项首先就排除了C和D,认为这样两个“引导词”叠用的情况很少见。在A和B两个选项中,选项A肯定不行,因为它引导宾语从句时不能充当句子成分,所以便选择了B。其实此题的正确答案应是D,第一个what 用作动词 meant 的宾语,第二个what 用作动词 said 的宾语。He was honest and told us all all he knew. 他很诚实,他把他知道的都告诉了我们大家。句中的第一个 all 为 us 的同位语,意为“我们大家”或“我们所有的人”;第二个all 实为 all that 之省略,其中的 all 为动词 told 的直接宾语,被省略的关系代词 that 为定语从句中谓语动词 knew 的宾语。当然此句也可说成 He was honest and told us all what he knew. 说明:引用此文请注明出处,并请保留该文章链接地址,谢谢~~