1. Bubbles， flaws， and other irregularities diffuse the light that passes through stained glass， _________ the glass sparkle.
A. which making
B. and making
C. making
D. to making
答案：C
分析：空格前的句子结构完整，这里的分词作状语。A中用which来引导非限制性定语从句，而句中无谓语，错;B中and作为连接词，而and后的句子不完整，没有谓语，错;D错，不定式的结构应该是to do.