This is an illness that can result in lung cancer ____ left untreated.
| A．after | B．if | C．since | D．unless |
相关试题
We are sparing no efforts to create ______ more peaceful and more advanced world, ______place where everyone enjoy his life and freedom．
| A．the；a | B．/；the | C．a；a | D．the；the |
_____ the chapter four times, I finally understood the author's theory．
| A．Reading | B．Having read | C．To read | D．Read |
Ann ______ here any more．She left last month．
| A．won't work | B．doesn't work | C．hasn't worked | D．isn't working |
You really need to go out and get some fresh air and sunshine．You ______ overworked
during the last two weeks．
| A．have been | B．were | C．had been | D．would be |
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