23. The class is unusual_______ the students are all over fifty and none of them attended the middle school when they were young.
| A．in how | B．in what | C．in which | D．in that |
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23. The class is unusual_______ the students are all over fifty and none of them attended the middle school when they were young.
| A．in how | B．in what | C．in which | D．in that |
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