單項選擇WearesureonedaytheairinBeijingwillbemuch

問題詳情：

單項選擇

We are sure one day the air in Beijing will be much ______ than today.

A. clean    B. cleaner      C. cleanest      D. the cleanest

【回答】

B

知識點：形容詞比較級

題型：選擇題