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、had not been

答案B

解析

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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

youfurtherproblemswithyourprinter,contactyourdealerforadvice.[2005]

Nowthatit’ssummer,thegenerationgapintheofficeisasobviousasthealmost-barefeetflip-floppingdownthehallway.Bab

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Somescientistsarethinkingtwiceaboutdoingorreportingcertainresearch,reactingtopoliticalandsocialcontroversyinad

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Whichofthefollowingsentenceshasanattributiveclause(定语从句)?

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Non-fatdairyproductssupplytheneedednutrientswithout______calories.

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A．免疫电泳B．免疫固定电泳C．蛋白电泳D．对流免疫电泳E．火箭电泳用于纯化抗原和抗体成分分析的是

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