Mary said it was at least five years since he ______ a good drink.

A．enjoyed

B．was enjoying

C．had enjoyed

D．would enjoy

青春期以前生精小管中一般只有（）。

A.支持细胞和精子

B.初级精母细胞和精原细胞

C.精子细胞和精子

D.支持细胞和精原细胞