The boy was badly ill ,_,he went to school at last?A and B however C or D but

问题描述:

The boy was badly ill ,_,he went to school at last?A and B however C or D but

B 表示转折 ,而且用逗号隔开,只能用B
尽管那个男孩病的很厉害,但是他最好还是去上学了