单选题 She thought I was talking about her son, ______, in fact, I was talking about my son.

【正确答案】 C
【答案解析】本题测试的是引导从句的引导词的区别。全句的意思是:“她以为我在谈论她儿子呢,而事实上我正在说我自己的儿子。”while是并列连词,表示“前后两个分句的对比”。其他三个词都是从属连词,引导从属复句。根据句意,应选答案C。