我認(rèn)為 it 之前是應(yīng)該加（或可以加）what 的,只不過很多時(shí)候都可以把它省略掉而已.換言之,在 it 之前加 what 或不加 what 都可以.
以下是從外國網(wǎng)頁復(fù)制下來的兩個(gè)例子：
例子一：
1a."You need to keep on using it and if you don’t,your skin will start to get even worse than what it was before." ［這句有 "what"］
1b."Your skin will get even more worse than it was before if you stop using (product xxx)." ［這句沒有 "waht"］
例子二：
The cumulative Current Budget Deficit in March (€3,706 million) is over 40% worse than what it was at this time last year (€2,613 million).And for March alone the Current Budget Deficit is over 50% worse than it was in the same month last year.［第一句有 "what"；第二句沒有 "what"］］