改错:It’s high time that they have their hair cut.

问题描述:

改错:It’s high time that they have their hair cut.

have 应改为had .
这是考查固定句型:It's high time that sb.did sth.正是某人该做某事的时候了.
在这个句型结构中,that从句要用虚拟语气,就是用过去式表示现在的情况.
所以此题要用had.