题目

(－7)×8可化为( ) A．－7××8   B．－7×8＋ C．－7×8＋×8   D．－7×8－×8 答案：D [() 12. (2015 •青岛) 一Listen!There someone at the door.一It must be your sister.   A. is;knocking   B. is;knock   C. are;knocking   D. are;knock