题干
一Shall we go for a picnic tomorrow?
一If it rain.
A：isn't
B：won't
C：don't
D：doesn't
答案(点此获取答案解析）
D
一Shall we go for a picnic tomorrow?
一If it rain.
A：isn't
B：won't
C：don't
D：doesn't
；它不可以发生的反应类型有：①取代②加成③消去④水解⑤酯化⑥中和⑦氧化⑧加聚