We have to complete the task on time _____ we can have three days off next week.

问题描述:

We have to complete the task on time _____ we can have three days off next week.
A.so that B.because C.unless D.though

Aso that,表目的,“以便”
我们必须/得按时完成这个任务,以便下周能休三天假.