句子 分析 英语 The number of people flying first class on domestic
句子 分析 英语
The number of people flying first class on domestic flights rose sharply in 1990,doubling the increase of the previous year.x0b
a.doubling the increase of
x0bb.doubling that of the increase of
分析 错在哪里 doubling后面的句子什么成分