As you know it is my duty tomy younger sisters from being hurt when they are in danger.A.

问题补充：

As you know，it is my duty tomy younger sisters from being hurt when they are in danger.

A. prevent

B. save

C. stop

D. protect

答案：

A. prevent

B. save

C. stop

(答案→)D. protect

解析：考查动词词义辨析。句意：你知道，当我的妹妹们处于危险时保护她们是我的责任。A．prevent阻止B．save 救，节约 C．stop阻止 D．protect保护，根据句意所以D正确。