【题目】The mixture of better jobs, special government policies and having sponsors for studying abroad is ____lies behind the changes to China's brain drain.
A. what B. whether C. that D. where
在线课程【答案】A
【解析】
考查表语从句。句意：更好的就业机会、特殊的政府政策以及留学机构是中国人才流失背后的原因。分析句子结构可知此处为表语从句，从句中缺少主语，故A项正确。