“What are you busy for?”—This is a question we very often get _____ nowadays.

A．asking

B．being asked

C．asked

D．to ask

下列属于做PICC禁忌证的是（）。

A.早产儿

B.肘部静脉血管条件差

C.长期输液患儿

D.肠道外营养

E.缺乏外周静脉通路