When ________ to the market, these products were very popular.
| A．introducing | B．introduced |
| C．introduce | D．being introduced |
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So the man left France, _______ to give up the fortune that would one day come to him, _______ to live in England.
| A．to prefer; went | B．preferring; had gone |
| C．preferred; going | D．preferring; and went |
--- I didn’t tell my parents the secret yesterday.
--- But you ______.
| A．ought to do | B．ought to | C．should | D．ought to have |
In 1911, Madam Curie received a second Nobel Prize for her research, the first person in the world ______ two Nobel Prizes.
| A．receiving | B．received | C．to receive | D．being received |
--- The floor is dirty. Can anyone clean it?
--- ______. I do it all the time.
| A．Don’t mention it | B．Why you? | C．Not sure. | D．Not me again. |
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