The professor said he could talk on _____ interested the audience.A.any topicB.which topicC.whichever topicD.the topic he thought it
参考答案：
C解析whichever已失去疑问含义，等于 anything that，表示强调；而 which topic中 which保留疑问含义，译成哪一个题目，不符合句义。而A和D中缺少连词。
