Spring Festival is the most important festival in China and an occasion all family member

问题补充：

Spring Festival is the most important festival in China and an occasion all family members get together, just like Christmas in the West.

A. where

B. when

C. that

D. which

答案：

A. where

(答案→)B. when

C. that

D. which

解析：考查定语从句。定语从句all family members get together修饰先行词occasion。这个定语从句结构很完整，所以使用关系副词，本题的occasion是指时间，所以用when。句意：在中国春节是最重要的节日和全家团聚的时刻，就像西方的圣诞节一样。