I shall never forget those days I stayed on the island you visited last week.
A. when, where
B. which, which
C. when , which
D. which , where
网友回答
A. when, where
B. which, which
(答案→)C. when , which
D. which , where
解析：本题考察的是定语从句，修饰时间那些天可用关系词when，修饰名词islands可用关系词which，本题的含义为我将从来不会忘记那些我待在岛上的日子，是我上周所参观的岛，故本题选C。