题目

Last weekend, we for a picnic and a good time. A . go, have B . went, have C . went, had 答案：C将甘氨酸和丙氨酸混合，在一定条件下发生缩合反应生成二肽的化合物总共有(   )A. 4种            B.3种            C.2种            D. 1种