急性蜂窝织炎与丹毒的相同之处是()。
A.病变处皮肤颜色
B.是否寒战、发热
C.病变区域与周围界限
D.病变区是否化脓
E.是否需要床边隔离
参考答案:B
His mother looked very tired,for she _____ the house herself all day.
A.had cleaned
B.has been cleaning
C.had been cleaning
D.has cleaned