It's the third time you late for school this week.
A:were
B:are
C:had been
D:have been
人的新生命开始于( )
同纲生物之间的亲缘关系比同种生物之间的亲缘关系近.
联合国正式成立的标志是( )
有关天气预报的信息只能从广播中获取。 ( )