题目内容：

麻烦看看这道题The grain output of this year is much higher than____of last year.
1that 2such 3 which 4 what
为什么选1呢 不选其他

优质解答

选that 代替output
例如 The weather in Shanghai is much hoter than that of Beijing
加了that之后才是同类比较
such是如此
which和what都是引导从句的,这里也不对的