选D
Seriously speaking,I don't understand the situation at all.
完整的句子是I seriously speak that I don't understand the situation at all.
类似的还有Generally speaking,frankly speaking,Totally speaking
应该叫做动词进行时作状语
选D
Seriously speaking,I don't understand the situation at all.
完整的句子是I seriously speak that I don't understand the situation at all.
类似的还有Generally speaking,frankly speaking,Totally speaking
应该叫做动词进行时作状语