3、 (2011年南京模擬)People begin to know that most environmental problems exist because necessary measures for preventing them________taken in the past.
A.a(chǎn)re not B.were not
C.hadn’t been D.wouldn’t be
3、解析:選B?疾閯(dòng)詞的時(shí)態(tài)。句意:人們開始了解到由于在過(guò)去沒有采取必要的預(yù)防措施從而造成了大多數(shù)的環(huán)境問(wèn)題。in the past暗示出用過(guò)去時(shí)態(tài);hadn’t been指在一個(gè)過(guò)去的動(dòng)作或時(shí)間之前發(fā)生的事情;wouldn’t be表過(guò)去將來(lái),故B項(xiàng)正確。


科目:高中英語(yǔ) 來(lái)源: 題型:
(2011年南京模擬)People begin to know that most environmental problems exist because necessary measures for preventing them________taken in the past.
A.a(chǎn)re not B.were not
C.hadn’t been D.wouldn’t be
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