如肘关节囊有严重挛缩畸形时，术中彻底切除瘢痕组织，充分松解，仍不能使肘关节伸直时，可在尺桡骨下端横穿一克氏针作骨牵引，最初的重量可用3～5kg。()

The girl sitting next to me on the plane was very nervous, for she            before.

A．hasn’t flown

B．hadn’t flown

C．didn’t fly

D．wasn’t flying