关于破伤风杆菌叙述正确的是

A．革兰阴性菌，具周鞭毛

B．通过伤口感染，细菌侵入血而致病

C．不能形成芽胞

D．芽胞抵抗力强

E．以上均不是

Some pictures of the river brought the days back to the old       they swam in it .

A．when

B．that

C．who

D．where