【题目】All the students went to the fields to take care of the little trees, ________ great damage had been done by the heavy rain.
A. at which B. to which C. on which D. with which
在线课程【答案】B
【解析】考查介词。句意：所有的学生都到田里去照看小树，大雨对它们已经造成了巨大的损害。定语从句先行词是little trees，指物，do damage to意为“对……造成伤害，损害”，介词to提到关系代词前，故选B。