题目

—We're doing a lot to protect our environment, but it is not good enough. —So we should try______ to look after it. A. hard    B. harder   C. hardest    D. hardly 答案：B 副词的比较级 句意“我们做了很多来保护环境，但是还不够。所以我们更应该努力的来保护”。

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