A doctor can expect _________ at any hour of the day or night．
A.callingB.to callC.being calledD.to be called在线课程D
解析：
句子主语是动词不定式动作的承受者，不定式要用被动式，expect to be done表示“期待着……”，强调被动．答案选D.例如：Many primary schools are going to be built this year．许多小学今年要被建立.