SAT 08年10月句子改进语法问题!

问题描述:

SAT 08年10月句子改进语法问题!
The Great Gatsby is now considered a classic novel in America's Jazz Age,but in 1925 its reviews would be mixed and its sales would have been disappointing.
C its reviews were mixed and its sales disappointing
为什么and 后面its sales disppointing 没有were动词也选呢?

its reviews were mixed and its sales disappointing
考平行结构,但后半部分省略了were
完整的形式是:its reviews were mixed and its sales were disappointing