Mankindmusthaveinmindthatitwillbeyears,evencenturies,...

Mankind must have in mind that it will be years, even centuries, ________the environment recovers from the damage they make to it.

A. that B. before C. when D. since

【解析】選B。考查狀語從句的連接詞。句意:人類必須要意識到遭到他們破壞的環境要恢復過來至少需要很多年甚至幾個世紀。It will be. . . before. . . “要過多少時間才能夠……” 。