—We're doing a lot to protect our environment, but it is not good enough. —So we should try______ to look after it.
A．hardB．harderC．hardestD．hardly
B
形容詞的比較級(jí) 句意“我們做了很多來(lái)保護(hù)環(huán)境，但是還不夠。所以我們更應(yīng)該努力的來(lái)保護(hù)”。
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