Inordertoknowaforeignlanguagethoroughly,fourthingsarene...
问题详情：Inordertoknowaforeignlanguagethoroughly,fourthingsaretly,wemustunderstandthelanguagewhenwehear____41____ndly,wemustbeabletospeakitourselvescorrectlywithconfidenceandwithouthesitation.____42___...