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 .
A.they assigned to do
B.to be assigned doing
C.that was being assigned doing
D.assigned for doing
E.it assigned to do
答案是E,但我看好像都不对
it指代the white house.排除A;
assign sb. sth./assign sb. to do sth.排除B,C,D
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