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问题: 英语问题

Mr Lu bought, _____ was most fashionable at
that time, a gold ring as a present for his
wife.
A.it B.which C.what D.that
请给出正确答案并解释,谢谢

解答:

主句为:Mr Lu bought a gold ring as a present for his wife.
"左逗右逗",中间的为非限制性定语从句.
排除ACD.
"what"可引导名词性从句,不可引导定语从句."that","it"不可引导非限制性定语从句.
选B