Will knew there was no doubt that patch of grass on the other side was in a different world.
A. which
B. what
C. that
D. whether
网友回答
A. which
B. what
(答案→)C. that
D. whether
解析：考查同位语从句。固定句式There is no doubt that…毫无疑问…；本题中的that引导的是同位语从句，解释doubt的内容，that在句中只起引导和连接的作用。故C正确。