The flu is believed________by viruses that like to reproduce in the cells inside the human nose and throat.
| A．causing | B．being caused |
| C．to be caused | D．to have caused |
相关试题
But for their help，we ______ the program in time.
| A．can not finish | B．will not finish |
C．had not finished | D．could not have finished |
We tried to find a table for seven，hut they were all .
| A．given away | B．kept away |
C．taken up | D．used up |
______ a certain doubt among the people as to the practical value of the project.
| A．It has | B．They have |
C．It remains | D．There remains |
China has got a good ______for fighting against the flu with its careful and smooth organization.
| A．reputation | B．influence | C．impression | D．knowledge |
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