阴茎折断保守治疗的缺点包括（）

A.继发感染形成脓肿

B.阴茎成角畸形

C.阴茎纤维化

D.局部遗留有瘢痕硬结

E.阴茎勃起疼痛

I don’t remember how many years ago ______________I paid my last visit to the principle of my primary school.

A．it was that

B．was it that

C．it was when

D．was it when