The sunspot came into its active stage, ____ that happens once every eleven years.

A．one

B．it

C．the one

D．what

产后抑郁的常见证候是（）

A.脾虚肝郁证

B.气血两虚证

C.肝经火旺证

D.心肾不交证

E.瘀血内阻证