The report noted that nicotine breathed in by a smoker increased the need of the heart ________ oxygen
| A．to | B．on | C．in | D．for |
相关试题
________ well in an interview will 
be an important part of getting a place at university.
| A．Do | B．Doing | C．Done | D．Being done |
In our country, every boy and every girl the equal right to go to school.
| A．has | B．have | C．is | D．are |
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