第20题: [单项选择]Have you ever been in a situation, ______ you know the other person is right yet you cannot agree with him A. by which B. that C. in where D. where 参考答案:D 答案解析:where引导定语从句,用来修饰“in a situation”这个表示所处境况的短语,相当于“介词+which”。如果用that则是同位语从句,且that前不能有逗号。