1. B
his seeing so much in the war是one's doing sth结构,即所谓的动名词短语的复合结构.它可以在句中充当主语.
2. A
doubt所接的宾语从句,如果主句是否定句,则从句用that引导.
3. had been lost或was/got lost
4. had hidden
5. 翻译:In fact, it was by accident that he was found by the security guard when he entered the office.
我是用强调句型翻译的.简单翻译课如下:
He was found by the security guard by accident when he entered the office.
6. 翻译:Tom is no longer what he used to be. 原创回答团