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
Last month, the Japanese government expressed their thanks for the aid they ______ from China.
| A．receive | B．had re ceived |
C．have received | D．are receiving |
If you _____ smoke, please go outside because this is a non-smoking office.
| A．must | B．should | C．can | D．may |
––Who would you rather _____ your graduation ceremony tomorrow, your parents or friends?
––All of them.
| A．will have attended | B．have attended | C．attended | D．to attend |
In that school, English is compulsory for all students, but French and Russia are ____ .
| A．special | B．optional | C．regional | D．original |
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