Question

4. They went through the plan over and over again to make sure that there was no of failure.

   A. sign   B. idea

   C. thought   D. possibility

Answer 1

4. D

4. D解析:句意:他们把计划看了一遍又 一遍，以确信没有失败的可能性。thereis/was no possibility of. ..没有 的可能性，符合题意。sign迹象;idea想法; thought思考，想法。