Every possible means ______ to prevent the air pollution, but the sky is still not clear.
| A．has been used | B．have been used | C．is used | D．are used |
相关试题
Yesterday she sold her car，______________ she bought a month ago.
| A．whom | B．which | C．that | D．where |
The whole family _______ to Shanghai for holiday next week.
| A．is going | B．are going | C．goes | D．have gone |
Mother told me ________a noise in the hall.
| A．don’t make | B．make not to | C．not to make | D．to make not |
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