In 1994 the white house named Dr RuthR. Faden chairperson of the federal advisory committee of experts they assigned to do a report on the history and ethics of the government's radiation experiments on humans in the 1950's and1960's.
In 1994 the white house named Dr RuthR. Faden chairperson of the federal advisory committee of experts they assigned to do a report on the history and ethics of the government’s radiation experiments on humans in the 1950’s and 1960’ s .
如果D是assigned to do估计我就选D了。it assigned to do我总觉得有些歧义,可以是修饰the federal advisory committee of experts,也可以是experts。按GMAT的风格的话修饰对象应该是experts了。it指的是the white house。