The professor said he could talk on （）interested the audience．
- Aany topic
- Bwhich topic
- Cwhichever topic
- Dthe topic he thought it
问题
The professor said he could talk on （）
参考解析：
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。
分类：小学英语专业知识：英语语法题库
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