-How  long ________inBeijing?

-For just the  weekend.  I'II be back for work next Monday.

A． have you stayed

B． do you stay

C． did you stay

D．are you staying

可引起血糖降低的情况有（）。

A.甲状腺功能亢进

B.胰岛素用量过大

C.口服避孕药

D.Ⅰ型糖原累积病

E.恶病质