问题
选择题
It was raining hard, _______ we went on with our work in the field. [ ]
A. though
B. but
C. although
D. so
答案
答案：B
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It was raining hard, _______ we went on with our work in the field. [ ]
A. though
B. but
C. although
D. so
答案：B
）是食品添加剂的增香原料。
)是一种医药中间体。由茴香醛
)合成E（其他原料自选），涉及的反应类型有（按反应顺序填写）______________。