—Were doing a lot to protect our environment but it is not good enough. —So we should tr

问题补充：

—We e 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：

A. hard

(答案→)B. harder

C. hardest

D. hardly

解析：形容词的比较级 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”。