The air in Beijing is getting much ______ now than a few years ago.A．cleanB．clea
题型：不详难度：来源：
The air in Beijing is getting much ______ now than a few years ago.| A．clean | B．cleaner | C．cleanest | D．the cleanest |
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答案
| B |
解析
| 句中有than要用比较级。北京现在的空气比几年前干净多了。 |
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