问题描述：
1,do you know the man ____your father nodded?
2,the knife _____we used to cut the bread is very sharp.3,he isthe person _____you can discuss poems.4,is this the fartory ______computers are built?都填什么呀（介词+关系代词填空）
2,the knife _____we used to cut the bread is very sharp.3,he isthe person _____you can discuss poems.4,is this the fartory ______computers are built?都填什么呀（介词+关系代词填空）
问题解答：
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