---------- l would not have been very tireda.lf didn't sit up too late b.hadn't l been sit up too latec.were l not to sit up too lated.had l not sat up too late

问题描述:

---------- l would not have been very tired
a.lf didn't sit up too late
b.hadn't l been sit up too late
c.were l not to sit up too late
d.had l not sat up too late

d.had l not sat up too late