by next week是什么用法

题目

by next week是什么用法
Dear,you need to ——————————by next week,to go touniversity at home or to go abroad..You are going on eighteen.OK,Mum.I am considering it.
A.make an appointment B.make a suggestion C.make a decision

答案

选C　 make　 a　 decision
－亲爱的,到下周为止,你需要做出决定：是在国内上大学,还是出国?你要十八岁了
－好的,妈妈.我在考虑.
by　 next　 week　 到下周为止,可以用将来时或将来完成时