答：時間和條件狀語從句中用現(xiàn)在時態(tài)表示將來,人稱“主將從現(xiàn)”.
例：I will tell him about it if(/when) I see him tomorrow.
本題Many people have realized that 是主句,為現(xiàn)在完成時,不影響that-賓語從句的謂語動詞.可忽略不看.只看下一句就行：
We won't have any more clean water to drink unless something _____ to fight against pollution.
unless=if...not...是引導(dǎo)條件狀語從句的.
B是將來時,A是過去時,C是非謂語,可排除.
D.是一般現(xiàn)在時的被動語態(tài).
unless sth.is done to fight against pollotion= If sth.is not done to ...
=if we don't do sth.to fight.
譯：許多人已經(jīng)意識到,如果不采取措施與污染作斗爭,我們將不再有干凈的飲用水可喝.
Many people have realized that we won't have any more clean water to drink unless something _____ to fight against pollu
Many people have realized that we won't have any more clean water to drink unless something _____ to fight against pollution.
A.was done B.will be done C.to be done D.is done
A.was done B.will be done C.to be done D.is done
英語人氣：164 ℃時間：2019-08-19 07:19:28
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