The playground is wet this morning.It must rain last night.（改为反意疑问句)The playground is wet this morning.It must rain last night.（改为反意疑问句) 为什么呢
问题描述：
The playground is wet this morning.It must rain last night.（改为反意疑问句)
The playground is wet this morning.It must rain last night.（改为反意疑问句) 为什么呢
答
The playground is wet this morning.It must have rained last night, didn't it?
答
The playground is wet this morning.It must rain last night.isn't it?