要组成移位寄存器型十进制环形计数器需要十个D触发器。
Theboycomplained_______apaininhisstomach.
缓解哮喘急性症状的首选药物是()
Theprofessoraskedaquestion,andDavid________agoodanswer.
Shehasnohostilitytous,_____canbejudgedfromhereyes。
Bothofmybrothersarenowmarried,soIhavetwo_____.