yourself you should never put convenience before safety.A. ProtectingB. Having protected

问题补充：

yourself, you should never put convenience before safety.

A. Protecting

B. Having protected

C. Protect

D. To protect

答案：

A. Protecting

B. Having protected

C. Protect

(答案→)D. To protect

解析：句意：为了保护自己，你不应该先考虑方便，而不是安全。这里需要目的状语，所以用不定式做目的状语，选D。