由一元二次方程的定义可得m-1≠0，解得m≠1，
又m≥0，
故答案为：m≠1且m≥0．
He hurried to the booking office only________that all the tickets had been sold out.[ ]
A. to tell
B. to be told
C. telling
D. told
工业萘原料馏分一般须经脱（）后进行精馏。
