当制备脂肪性基质的栓剂时，制栓机模孔内应涂的润滑剂是

A．液状石蜡

B．植物油

C．凡士林

D．软肥皂、甘油各1份、95%乙醇5份混合所得

E．二甲硅油

– Amazing! You _____ have won the first prize in the national English speech contest!

– I’m lucky that all my efforts have finally paid off.  

A．must

B．may

C．can

D．should