可转换公司债券发行后，累计公司债券余额不得超过最近一期末净资产额的( )。

A．20%

B．30%

C．40%

D．50%

The book was written in _________ easy English _________ even primary school students could understand it.

A．so; that

B．such; that

C．too; to

D．very; that