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

問題詳情：

—We’re doing a lot to protect our environment(環境), 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

知識點：動詞和動詞短語

題型：選擇題