题干
—________ have you been married ?
—For twenty years.
A：How far
B：How often
C：How long
D：How soon
答案(点此获取答案解析）
C
—________ have you been married ?
—For twenty years.
A：How far
B：How often
C：How long
D：How soon
2NH3（g） △H="-" 92.4 kJ/mol。
