Another drug that has helped improve people’s health is penicillin, _________ is _________ by many _________ one of the most important medicines.

A．which, considered, being

B．that, considering, been

C．that, to consider, being

D．which, considered, to be

仓单是保管人应存货人要求而签发的一种有价证券，如仓单损毁、遗失或被盗，存货人确认其权利的程序是（）

A.请求保管人另行签发

B.请求法院公示催告

C.存货人出具说明

D.存货人需在事发的三天内登报声明