问题描述：
The indoor swimming pool seems to be a great more luxurious than ____.
A is necessary B whom is known c what is known D which is known
打错了选项。
B being necessary C to be necessary D it is necessary
A is necessary B whom is known c what is known D which is known
打错了选项。
B being necessary C to be necessary D it is necessary
问题解答：
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