— Shall we invite Tom to play football now?

— Oh, no. He _____ his clothes. [ ]

A. is washing

B. washes

C. has washed

下列引起血液性缺氧的病因是（）

A.呼吸道狭窄

B.心力衰竭

C.氰化物中毒

D.脉动脉栓塞

E.亚硝酸盐中毒