________ the police thought he was the most likely one，since they had no exact proof about it，they could not arrest him.

A．Although

B．As long as

C．If only

D．As soon as

下列何种试验可用于肺炎链球菌的快速诊断( )

A．培养
B．胆汁溶解试验
C．糖发酵试验
D．毒力试验
E．荚膜肿胀试验