Lily's mobile phone was left in a taxi accidentally, never____ again. [ ]

A. to find

B. to be found

C. finding

D. being found

下列关于溶液的说法正确的是[ ]

A．溶液一定是无色透明的

B．溶质一定是固体

C．温度不变时，不饱和溶液变成饱和溶液，其溶质的质量分数不一定增大

D．饱和溶液一定是浓溶液