I taking his illness lying down he insisted on working to the end heart and soul.A. On a

问题补充：

I taking his illness lying down, he insisted on working to the end heart and soul.

A. On account of

B. In the face of

C. Instead of

D. In front of

答案：

A. On account of

B. In the face of

(答案→)C. Instead of

D. In front of

解析：On account of意为：因为，由于；In the face of 意为：面对；Instead of意为：代替，而不；In front of在前面。