单选题The machine has been&nbsp

问题补充：

单选题Themachinehasbeenusedmanyyears_____itdoesn’tworkwelloccasionally.A.That’s becauseB.It’s no wonder thatC.There’s no doubt ifD.It’s unlikely that

答案：

B解析t’s no wonder that …难怪……。A中because 要改为why; C中if要改为 that。