下列可分泌细胞因子的细胞类型有（）。

A.角质形成细胞

B.朗格汉斯细胞

C.淋巴细胞

D.成纤维细胞

— Can you guess ______ the MP4 player yesterday?

— Sorry, I've no idea about it.[ ]

A.how much did he pay for

B.how can he get

C.how much he paid for

D.how did he get