since you ———the most difficult exam ,you have nothing to worry about now

问题描述:

since you ———the most difficult exam ,you have nothing to worry about now
A,pass B passed C had passed D have passed
主要是AD的讲解,since后加完成时是不是要可持续动词

D
这里since表示既然,而不是自从,所以不存在后面加可持续动词的问题……