请各位帮我看看这两空填什么单词!1.Each time ______ they met,they would talk long hours together.2.The direction ______ a force acts can be changed.

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请各位帮我看看这两空填什么单词!1.Eachtime______theymet,theywouldtalklonghourstogether.2.Thedirection______aforceact

请各位帮我看看这两空填什么单词!1.Each time ______ they met,they would talk long hours together.2.The direction ______ a force acts can be changed.
请各位帮我看看这两空填什么单词!
1.Each time ______ they met,they would talk long hours together.
2.The direction ______ a force acts can be changed.

请各位帮我看看这两空填什么单词!1.Each time ______ they met,they would talk long hours together.2.The direction ______ a force acts can be changed.
http://zhidao.baidu.com/question/181946860.html
http://zhidao.baidu.com/question/49622138.html

1、when 2、of