He was honest and told us ______ he knew.
A. that that B. what what
C. all all D. which which
He was honest and told us ______ he knew.
A. that that B. what what
C. all all D. which which
C
第一个 all 用作 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. 全句意为“他很诚实，告诉了我们大家他所知道的所有情况”。