问题补充:
Mrs Green are very grateful to the neighbour helped her child out of the fire.
A. which
B. what
C. who
D. how
答案:
A. which
B. what
(答案→)C. who
D. how
解析:根据语境可知此句的先行词是the neighbor是人,且在从句中做主语故选who,故选C。
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