题目

The company       we worked 3 years ago has grown into one of the biggest companies in our country. A.that                   B.when                 C.in which             D. which 答案：C在检测还原糖的实验中，加入斐林试剂时必须要(　　) A．先加入斐林试剂甲液，后加入乙液 B．先加入斐林试剂乙液，后加入甲液 C．将斐林试剂的甲液和乙液混合均匀后再加 D．以上ABC三项操作方法都正确