The rate ___which wild animals are being destroyed has increased.填一个介词 ,为什么是at

The rate ___which wild animals are being destroyed has increased.填一个介词 ,为什么是at

题目
The rate ___which wild animals are being destroyed has increased.填一个介词 ,为什么是at
还有一题 She told me that the school day is the time ___I can see my friends.
选项:in which on which when that 好像可以填好几种 解释下原因(这个题目是高一模块一31页上的)谢谢
答案
举一反三
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