Allparticipantsweretoldtheywerefreeto______answeringanyofthequestionsatanytime。
A.reject B.decline C.disapprove D.refuse正确答案B
Allparticipantsweretoldtheywerefreeto______answeringanyofthequestionsatanytime。
A.reject B.decline C.disapprove D.refuse正确答案B