(   ) 1. If we don't protect our environment ，nobody          what will happen in the future.

A. know B. knew

C. knows D. have known

l.C 由if引導(dǎo)的從句可知，主句要用一般現(xiàn)在時(shí)；nobody為不定代詞，作主語時(shí)謂語動(dòng)詞要用單數(shù)形式。

題目來源：仁愛英語同步練習(xí)冊(cè)九年級(jí)上冊(cè)下冊(cè)合訂本 > Topic2 All these problems are wery serious.

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