— How long has your brother been working in this factory?

— 　　　 he graduated from college.

A．When

B．By the time

C．Until

D．Ever since

知柏地黄丸的功能是（）。

A.滋阴养血

B.滋肾养肝

C.滋肾养肺

D.滋阴降火

E.滋阴益阳