18.I’m afraid I won’t have any influence over my 20-year-old son ____ his mind is made upA.once B.since C.unless D.while

来源：学生作业学帮网编辑：学帮网时间：2024/07/02 00:19:00

18.I’m afraid I won’t have any influence over my 20-year-old son ____ his mind is made up
A.once
B.since
C.unless
D.while

A
一旦他已决定,对于我二十岁的儿子我是很难再对他施加任何影响的.

A
一旦