Dung beetles ______ an integral part of the successful management of diary farms in Australia over the past few decades.

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问题 Dung beetles ______ an integral part of the successful management of diary farms in Australia over the past few decades.

选项 A、has become
B、have become
C、became
D、had become

答案B

解析时态题。在由until(till，up to)now，up to the present，so far，in (for，over，during)the past(last，recent)few(several，two．．．)months(days．．．)等构成的短语作状语的句子中常用现在完成时。主语dung beetles复数形式，故B正确。

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专业英语四级

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Dung beetles ______ an integral part of the successful management of diary farms in Australia over the past few decades.

专业英语四级

HewenttoBeijing,______aroominacheaphotel,andspentthefollowingweekinsearchofhissister.

Heworealargehatandsunglassesasa______andhopedthatnoonewouldrecognizehiminthestreet.

Thismachineisn’tworking;getamechanicto______it.

Unfortunatelythereportwasprepared______andcontainedseveralinaccuracies.WhichofthefollowingphraseisNOTcorrecttoc

AnEnglishVocabularyGameWhoeverthoughtlearningnewwordscouldfeelsociallyresponsible?/AWebsitecalledFreeRice.

Notforamoment______byherbeautifulwords.

AdvicetoFreshmanYouhavebeenatFurnellUniversityfortwoweeksnow.Asusual,youneedenoughtimetosleepandeat.Y

Arecentsurveyshowsthathalfoftheyoungstudentshaveexperiencedthecyberromanceorhaveshowngreatinterestinit.How

Formanyyears,wehavebeenledtobelievethataperson’sintellectualintelligenceisthegreatestpredictorofsuccess.Soci

ExperiencedobserversonAmericancampuseshavebeguntonoticeanewgroupofmothersandfathersemergingoverthepasttwoye

理想气体分子间碰撞是()。

成人血清铁的正常值为()

对于妊娠合并淋菌下列哪项叙述是不恰当的

撤销要约时，撤销要约的通知应当在受要约人发出承诺通知()到达受要约人。

自然环境包括：①土地；②空气；③淡水；④食物；⑤能源；⑥原料；⑦地质；⑧地貌；⑨气候；⑩生物。在这十项中，对城市来说，最重要的资源是()。

相比于替代互换,市场间利差互换的风险()。

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根据语谶《预言》定国号的有()

—个Ethernet网络和—个TokenRing网络的互连可以通过以下______网络设备实现。