There are several story-books ____ Red Star is the best one ____ I have ever read
A whose ;that B of which ;that C which ;that D of which ;as
B
第一个定语从句原本是 Red Star is the best one of the several story-books
第二个定语从句原本是 Ihave ever red the best one,因为先行词为one,所以引导词只能用that