Inordertoknowaforeignlanguagethoroughly,fourthingsarene...
問題詳情：Inordertoknowaforeignlanguagethoroughly,fourthingsaretly,wemustunderstandthelanguagewhenwehear____41____ndly,wemustbeabletospeakitourselvescorrectlywithconfidenceandwithouthesitation.____42___...