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问题: 英语问题

Read the text a second time and you will
probably know what the principle ______ a
hovercraft works.
A.is on that B.has on which
C.is on which D.on which
请给出正确答案并解释,谢谢

解答:

我认为应选C,由于意为规则是什么应后面用is,又由于work为不及物动词,不可直接加宾语应加介词on,后意为做什么用that引导宾语从句.故得答.