Mary__________my letter;otherwise she would have replied before now.
| A．has received | B．ought to have received |
| C．couldn’t have received | D．shouldn’t have received |
Not until he left his home ______ to know how important the family was for him.
| A．did he begin | B．had he begun |
| C．he began | D．he had begun |
—Come on, please give me some ideas about the project.
—Sorry, with so much work ______ my mind, I almost break down.
| A．filled | B．filling |
| C．to fill | D．being filled |
Some customers accuse Toyota ______ being slow to fix the car problems, which makes them disappointed.
| A．in | B．at |
| C．with | D．of |
Zheng He's first stop during the expedition was in ______ is a part of Vietnam today.
| A．where | B．what |
| C．which | D．that |
He is said ______ to Beijing last week.
| A．go | B．to go |
| C．to have gone | D．having gone |