“If the government does not give any feedback or does not release a final report of the survey, the respondents will think they participated , said the social scientist Hu.
A. in no way
B. in vain
C. without effort
D. at a loss
网友回答
A. in no way
(答案→)B. in vain
C. without effort
D. at a loss
解析：in no way 决不；in vain枉费心机；徒劳无益；白费力气；without effort 轻松地; at a loss不知所措；困惑; in vain符合语境。