原句:The university has twice as many students as it did last year.
为什么是it did last year而不是it had last year?
同意好题老师的分析。下面两句都是对的:
正:The university has twice as many students as it did last year.(did是动词have的过去式替代词)
正:The university has twice as many students as it had last year. (had是动词have的过去式)
如果将 last year 改为 before,则下面两句都是对的(单独使用的 before 可连用一般过去时或现在完成时):
正:The university has twice as many students as it did before. (did是动词have的过去式替代词)
正:The university has twice as many students as it had before. (had是动词have的过去式)
正:The university has twice as many students as it has had before. (has had是动词have的现在完成时)