Theriverswillbecomedirtieranddirtier
來源:國語幫 7.18K
問題詳情:
The rivers will become dirtier and dirtier ______ we take action to protect them.
A. since B. if C. until D. Unless
【回答】
D
知識點:連詞
題型:選擇題
問題詳情:
The rivers will become dirtier and dirtier ______ we take action to protect them.
A. since B. if C. until D. Unless
【回答】
D
知識點:連詞
題型:選擇題