A:①②③
B:②③④
C:①②④
D:①③④
有人将100粒黄豆均分为两组,一组在黑暗条件下培养,一组在有光条件下培养,其他条件相同且适宜,结果都正常萌发,说明黄豆萌发的必需条件不包括( )
The bus got ________ in the snow and we had to walk the rest of the way.