The patient was in bad need of operation but there was no guarantee(保证) that she would su

问题补充：

The patient was in bad need of operation but there was no guarantee(保证) that she would survive the anaesthetic (麻醉剂), which made the doctors on the horn of a .

A. process

B. arrangement

C. ceremony

D. dilemma

答案：

A. process

B. arrangement

C. ceremony

(答案→)D. dilemma

解析：考查名词辨析。A进程；B安排；C仪式；D困境，窘境。句意：那位病人急需手术，但是无法保证她能从麻醉剂中生还，这使医生们陷入进退两难的境地。on the horn of a dilemma进退两难。故选D。