问题描述：
一道英语选择题（说清楚原因）
Mr White is of great help.You _______let him go.
A.had not better
B.had better don't
C.had better not
D.had no better
Mr White is of great help.You _______let him go.
A.had not better
B.had better don't
C.had better not
D.had no better
问题解答：
我来补答展开全文阅读