至于为什么她却不太清楚。
It is no use asking her, she does not know anything.
问他没有用，他什么也不知道。
She does not know how to get to the next block.
她不清楚怎么去下一个街区。
She does not know London very well, and she lost her way.
她对伦敦不很熟悉，因此迷了路。
她不知道做什么。
She does not know London very well, and lost her way.
她对伦敦不是很熟悉，因此她迷了路。
She can not have been to your house. She does not know your address.
她不可能去你家，她不知道你的地址。
She can not have been to your house. She does not know your address.
她不可能去你家，她不知道你的地址。
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