Every possible means ________ to prevent the air pollution，but the sky is still not very clear.
| A．were using | B．have used |
| C．has been used | D．was used |
相关试题
. I was still sleeping when the fire______, and then it spread quickly.
| A．broke out | B．put out | C．run out | D．came out |
— How about eight o’clock outside the cinema?
— That ______ me fine.
| A．fits | B．meets | C．satisfies | D．suits |
Over the past decades, sea ice ______in the Arctic as a result of global warming.
| A．had decreased | B．decreased |
| C．has been decreasing | D．is decreasing |
Bill was doing a lot of physical exercise to build up his______.
| A．energy | B．strength | C．force | D．power |
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