她从来就不知道他姓什么，只知道他的名字。
She'd never known his surname, only his first name.
《柯林斯英汉双解大词典》
她的名字叫玛丽，我不知道她的姓是什么。
Her first name was Mary. I don't know what her surname was.
人家没有告诉她贝蒂姓什么，要不然也许是她忘了。
If you are asked personal questions you need not to answer them.
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