Thereweretwoboysinthelab, ___

There were two boys in the lab, ______did the experiment successfully.A.the clever of whomB.the cleverer or whomC.the clever of themD.the more clever of them

参考答案：
B解析选B。“the + 形容词比较级+of+名词复数”表示“两者中较…的一个”；此处关系代词whom指代the two boys