never before in china -- for the teachers

has so much been done原因：如果句子以never,only,seldom等否定含义或者半否定含义的副词开头,那么后面的句子应该采取部分倒装。本句采取的是现在完成时态,正常的表达应该是So much has been done for the teacher。这里要倒装 因此是 has so much been done for the teacher。