Every possible means _______to prevent the air pollution, but the sky is still not clear.
A．a(chǎn)re being usedB．have been usedC．has been usedD．had been used
練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題


---Let’s see if the basketball game has started yet.
---Started? It must be clear who   by now.
A．is winningB．winsC．has wonD．would win

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

Barbara is easy to recognize as she’s the only one of the women who________evening dress.
A．wearB．wearsC．has wornD．have worn

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題


In the past few months, a discussion ________about whether selecting “Three Goods” Students in elementary and middle schools should be cancelled.
A．has to be heldB．has been heldC．has been holdingD．was held

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題


The young girl sitting next to me on the plane was very nervous.She ______before.
A．hasn’t flownB．didn’t flyC．hadn’t flownD．wasn’t flying

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題


．— Has Tom finished his report so far?
— I have no idea．He ______it this morning．
A．didB．has doneC．was doingD．had done

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題


If you try to learn too many things at a time at the beginning, you may _______.
A．have confused B．have to be confused
C．get confused D．get confusing

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題


. In September 2008 , China’s key milestone in space travel_____when Zhai Zhigang conducted the first space walk.
A．reachedB．was reachedC．has reachedD．had been reached

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題


All the students were looking forward to_______here.
A,   come  B. being coming  C.  came    D.coming

查看答案和解析>>

同步練習(xí)冊(cè)答案