题干
. Do what you think is right, ______ you will gain a surprising happy ending.
A：and
B：but
C：before
D：/
答案(点此获取答案解析）
A
A：and
B：but
C：before
D：/
封，置于适宜温度下培养，你认为24h后产生乳酸和酒精最多的容器分别是
的定义域为R，
是