Most environmental problems exist because adequate measures for preventing them______ taken in the past.

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问题 Most environmental problems exist because adequate measures for preventing them______ taken in the past.

选项 A、was not
B、were not
C、were not being
D、being not

答案B

解析被动语态的时态、数、性的一致，主要由助动词来表示，要注意它们与主语的一致。此处从句的主语measures是复数，因此选择答案B。

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专业英语四级

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Most environmental problems exist because adequate measures for preventing them______ taken in the past.

专业英语四级

Nancybecameataxidriverbecause

ThecolonistsofPlymouth,Massachusetts,whohadsettledtherehadleftEnglandbecausetheyfelt______ofreligiousfreedom.

______thathe’salreadyheardthenews.

Ididn’tgotohispartylastnight,because______Ichangedmymind.

WhydoestelevisioncarrymorenationaladvertisingthananyothermediuminPortugal?

Comparedwiththesamequarterlastyear,thesecond-quarterprofitsincreasedby______thisyear.

I’vealreadytoldyouthatI’mgoingtobuyit,______.

Iunderstand______preparationthatstaffmostputinunderpressuretomeetthedeadline.

Theboycyclinginthe.streetwasknockeddownbyaminibusandreceived______injuries.

Streetsellers,particularlyindevelopingcountries,【C1】largeamountsoffoodtopeople【C2】lowincomes.Thissector

系统按照其复杂程度和层次不同分为_和_。

如果概念A与概念B之间有真包含于关系，则概念A为()、概念B为属概念。如在“草绿”与“色泽”之间，“草绿”是种概念，“色泽”是属概念。

性能代号为“ZSTX”代表()。

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在社会主义市场经济体制建立以后，国家对企业的管理应以()为主。[2007、2006年真题]

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Thesecuritymarketlinedepicts______.

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Most environmental problems exist because adequate measures for preventing them______ taken in the past.

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______thathe’salreadyheardthenews.

Ididn’tgotohispartylastnight,because______Ichangedmymind.

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I’vealreadytoldyouthatI’mgoingtobuyit,______.

Iunderstand______preparationthatstaffmostputinunderpressuretomeetthedeadline.

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