The flu is believed ______ by viruses that like to reproduce in the cells inside the human nose and throat.
| A．to be caused | B．to have caused | C．being caused | D．causing |
相关试题
Nobody believed his reason for being absent from the class he had to meet his uncle at the airport.
| A．why | B．that | C．where | D．because |
Mary, here – everybody else, stay where you are.
| A．come | B．comes | C．to come | D．coming |
Could I speak to is in charge of International Sales please?
| A．who | B．what | C．whoever | D．whatever |
As there is less and less coal and oil, scientists are exploring new ways of making use of
energy, such as sunlight, wind and water 
for power and fuel.
| A．primary | B．alternative | C．instant | D．unique |
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