Theyaretalkingaboutthethingsandpeople_____theysawwhentheywereinLondonAwhichBwhatCwhoDthat
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题目内容：
They are talking about the things and people_____they saw when they were in London A which B what C who D that
优质解答
D.当定语从句的先行词既有人又有物时,关系代词必须用 that.
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