问一道GWD

shinell2009

GWD31-37

In 1994the white house named Dr RuthR. Faden chairperson of the federal advisorycommittee of experts they assigned to do a report on the history andethics 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

正确答案是E，但是实在想不清楚为什么是E，这道题一开始就理不清层次，求NN指点~

shinell2009

木有人吗？自己顶一下