有上百种不同种类的恐龙,但是他们不是生存在同一个时代.
Hi,很高兴为你解答!
还有其他疑问的话欢迎一起讨论!谢谢，还想问一个There ________ ( not be ) enough students to practise playing football that day.weren't【解释】there be句型就近原则 后面是 students 所以用复数that day 那天，过去式所以是were