Last Sunday I went to visit the History Museum where I saw a pot _________ about 1,000 years before.

A．so it had been

B．so had it been

C．what it had been

D．as it had been

有关维生素K的叙述，错误的是

A．天然维生素K为脂溶性

B．参与凝血因子的合成

C．对于应用链激酶所致出血有特效

D．维生素K1注射过快可出现呼吸困难

E．较大剂量维生素K3可出现新生儿溶血