A. 邻苯二胺(OPD) B. 过氧乙酸 C. 四甲基联苯胺(TMB) D. 对-硝基苯磷酸酯 E. 4-甲基伞酮基-R-D半乳糖苷(4-MUU)
A. that B. which C. because D. as