27. The process of producing electricity may also give out CO2, _______ you heat your house with electricity instead of charcoal.
| A．even if | B．as long as | C．as if | D．as soon as |
相关试题
Listening to loud music at rock concerts caused hearing loss in some teenagers.
| A．is | B．are | C．has | D．have |
Ti
m is in good shape physically he doesn't get much exerci
se.
| A．if | B．even though | C．unless | D．as long as |
I walked slowly through the market, where people all kinds of fruits and vegetables. I studied the prices carefully and bought what I needed.
| A．sell | B．were selling | C．had sold | D．have sold |
So far nobody has claimed the money in the library.
| A．discovered | B．to be discovered |
| C．discovering | D．having discovered |
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