I am sure that the changing of colors must be a beautiful spectacle ______ I should never be tired.
(A) that
(B)of which
(C) which
(D) in that

正常來說要填which，但因為tired of的"of"倒裝了(沒在句尾看見它)，所以要把 of 加在 which 前面，變成 of which。