That’s a good suggestion! Let’s finish our work _____ we can be

That’s a good suggestion! Let’s finish our work _____ we can be free this evening.
A、now that
B、that
C、because
D、so that
【正确答案】：D
【题目解析】：这是一个好的建议!让我们完成工作这样今天晚上就可以自由了; now that 既然，由于。