【题目】Your senses become alert and you suddenly find the answer to a problem ________ solution has long escaped you as a brilliant thought crosses your mind.
A. which B. that C. whose D. when
在线课程【答案】C
【解析】
试题分析：句意：当一个非凡的想法在你头脑中闪过时，你的思维变得敏锐起来，你突然找到让你困惑已久的问题的答案。此处是定语从句先行词是problem，表示“问题的解决方式”。故选C.