John shut everybody out of the kitchen ________ he could prepare his grand surprise for the party.

A．which

B．when

C．so that

D．as if

关于手术后拆线的时机下列哪些是正确的

A．头、面、颈部术后4～5天

B．下腹、会阴部6～7天

C．四肢6～8天

D．关节部位14天

E．青少年可适当缩短拆线时间，老年人可适当延长拆线时间