【C18】
A．which
B．it
C．what
D．who
请帮忙给出正确答案和分析，谢谢！
【C15】A．whetherB．itC．whatD．all
【C6】A．whichB．whereC．whatD．when
【C8】A．whichB．thatC．whatD．when
【C5】A．whichB．thatC．whatD．than
【C6】A．whichB．thatC．whatD．where
【C14】A．whichB．thatC．whatD．where
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