[单选题]Directions: In this part there is a sentence with four choices marked A, B, C and D. Choose the one that best completes the sentence.From 1902 to 1904，Picasso，the twentieth-century’s greatest western artist，painted a series of pictures （ ） the main color was blue.
A
when
B
that
C
where
D
which
正确答案：C
题目解析
分析句子可以确定先行词为pictures，（ ） the main color was blue为定语从句修饰先行词。分析句意可以确定从句中缺少地点状语，需要使用关系副词where，相当于in which，故选C。
