| The earth will become worse and worse ______ we do something to stop her from being polluted. |
A. if B. even if C. when D. unless |
科目：初中英語 來源：2014屆甘肅省蘭州市九年級上學期期末英語試卷（解析版） 題型：單項填空
The earth will become worse and worse ________ we do something to stop her from being polluted.
A. if?????????? B. even if???????? C. when?????????????? D. unless
科目：初中英語 來源：不詳 題型：單選題
| A．if | B．even if | C．when | D．unless |
科目：初中英語 來源：期末題 題型：單選題
科目：初中英語 來源： 題型：單選題
The earth will become worse and worse ________ we do something to stop her from being polluted.
| A．if | B．even if | C．when | D．unless |
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