5 Over a hundred people must have been driven away.______ they were.

问题描述:

5 Over a hundred people must have been driven away.______ they were.
a.I think b.I'm sure
c.Certain d.Of course
选A为什么

因为第一句话中用到了over a hundred,表示“一百以上”,这是一个虚数,所以用不太肯定的选项“I think”.其他选项都太肯定了.