语法专题  语法提分微点案考点11　情态动词和虚拟语气
微视角　大领悟
微学堂　涨分数
微考场　新演练
   微视角　大领悟 　
练知考情　会方法技巧
Mum: Are they there? Oh my goodness. I ______________ (put) them there when the phone rang.解析：　该空是对过去必定猜测，故填must have put。
must have put