A. | does | B. | is done | C. | will be done | D. | be done |
分析 一旦對環(huán)境的危害造成,使體系恢復(fù)要花費(fèi)多年的時(shí)間.
解答 答案是B.本題考查一般現(xiàn)在時(shí)的被動(dòng)語態(tài);題干中考查短語do harm to(對…有危害),harm和do 之間的被動(dòng)關(guān)系;由主句中的takes推斷題干說明的是一般情況,故用一般現(xiàn)在時(shí)的被動(dòng)語態(tài),答案是B.
點(diǎn)評 對時(shí)態(tài)的選擇,要在把握時(shí)態(tài)的基本用法的基礎(chǔ)上,根據(jù)具體語境和題干中的時(shí)間推斷時(shí)態(tài);同時(shí)關(guān)注動(dòng)詞的語態(tài),理清不同時(shí)態(tài)的被動(dòng)語態(tài)的形式以及主語和謂語動(dòng)詞之間的關(guān)系,做出合理的判斷.
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