What we are concerned about is that to what extent tests are harmful to students' creativity.前边主句中改成what we concern about···可不可以?为什么一定要用be+被动语态?另外,that从句that后面紧跟的那个‘to’是个什么成分起什么作用?把这to去掉可以么?
问题描述：
What we are concerned about is that to what extent tests are harmful to students' creativity.
前边主句中改成what we concern about···可不可以?为什么一定要用be+被动语态?另外,that从句that后面紧跟的那个‘to’是个什么成分起什么作用?把这to去掉可以么?
答