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We should spare no effort to protect our environment.
A:practice
B:start
C:remember
D:try hard
B:start
C:remember
D:try hard
参考答案
参考解析
解析：我们应该竭尽全力去保护环境。practice“练习，实践”，如：Practice makes perfect．熟能生巧。start“开始”，如：It is a chance to start afresh．这是一个重新开始的机会。 remember“记得”，如：Please remember to close the window when you go out．出门时请记得关窗。 try hard“尽力”，如：If you try hard , you will have a chance to succeed．如果你尽力，你就可能会取得成功。只有try hard意思上和spare no effort最接近。
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