保持句意不变,改写句子
问题描述：
保持句意不变,改写句子
Since you know everthing about this subject,you needn't take the exam.
如题,改写,句意不变.
____ _____ you know everthing about this subject,you needn't take the exam.
另：注意是两个空哦～
望回答速度快一些!
答
Now that 既然