--it is for us to see that he does his work so well!

选择C,相当于 it is a surprise\x05 for us to see that he does his work so well
感叹句通常由what,how引导,表示赞美、惊叹、喜 悦、等感情.
what修饰名词,how 修饰形容词,副词或动词,感叹句结构主要有以下几种：
掌握它的搭配,即掌握了感叹句的重点.How +形容词+ a +名词+ 陈述语序
How+形容词或副词+ 陈述语序
What +名词+ 陈述语序
What+a+形容词+名词+ 陈述语序
What+ 形容词+复数名词+ 陈述语序
What+ 形容词+不可数名词+ 陈述语序