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—We’redoingalottoprotectourenvironment(环境),butitisnotgo...

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问题详情:

—We’redoingalottoprotectourenvironment(环境),butitisnotgo...

—We’re doing a lot to protect our environment(环境), but it is not good enough.

—So we should try______ to look after it.

A. hard             B. harder              C. hardest             D. carefully

【回答】

B

知识点:动词和动词短语

题型:选择题