题干
________ for the free tickets, I would not have gone to the films so often.
A：If it is not
B：Were it not
C：Had it not bee
D：If they were not
答案(点此获取答案解析）
C
A：If it is not
B：Were it not
C：Had it not bee
D：If they were not
的方程
有一个根为1，则此三角形为( )