1、D 以下列副词或短语开头的句子,句子的主谓要部分倒装
2、D
The problem having been solved,这是一个独立主格结构,相当于一个时间状语从句.
相当于 After the problem had been solved, the engineer returned to his own factory.
问题被解决后,那工程师返回他自己的工厂.
关于独立主格结构,可以搜索一下相关资料看看.如有问题,请随时追问.
3、选A rather to learn
my approach is not to do sth. , but rather to do sth. 不是做...而是做...
but rather是“而是”的意思
前面结构是 is not to do sth, 后面对应的but rather to do sth. 两个都用不定式