问题
选择题
As we know, penicillin became the greatest drug of the 20th century, ______ millions of lives.
A．to save
B．saving
C．saved
D．Save
答案
答案：B
考查非谓语动词。根据句子结构可知， ______ millions of lives作伴随状语，save和它的逻辑主语penicililin之间是主动关系，故采用saving形式，to save表目的 ，saved表被动 save用于祈使句