He got well-prepared for the job interview for he couldn't risk the good opportunity. A.

问题补充：

He got well-prepared for the job interview, for he couldn risk the good opportunity.

A. to lose

B. losing

C. to be lost

D. being lost

答案：

A. to lose

(答案→)B. losing

C. to be lost

D. being lost

解析：考查固定搭配。固定词组risk doing sth冒险做某事；句意：为这次面试他做了很好的准备，因为他不能冒着失去这个好机会的危险。故B正确。