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

WriteonyourANSWERSHEETONEacompositionOfabout200wordsonthefollowingtopic:Writeanarticleentitled"Piracy".

Peoplecanbeaddictedtodifferentthings—e.g.,alcohol,drugs,certainfoods,oreventelevision.Peoplewhohavesuchanaddi

Mostpeoplefeelstressatsometimeintheirlives.Somepeoplelikethispressureandworkbetterbecauseofit.Otherpeople

Youshouldn’t______yourfather’sadvice.Anywayheismuchmoreexperiencedthanyouinthismatter.

Areyouthinkingabouttryingoutapoliticalcareerbutyour【C1】______arealittlelowforapresidentialbid?Youhaveuntil

Justasthebuilderisskilledinthehandlingofhisbricks,______theexperiencedwriterisskilledinthehandlingofhiswo

Sherememberedseveraloccasionsinthepast______shehadexperiencedasimilarfeeling.

Thiskindofglassesmanufacturedbyexperiencedcraftsmen______well.

We’dbetterwaittill20November.Tom______hisexambythensohe’llbeabletoenjoyhimself.

______,glassescancorrectmostsightdefectsinhealthyeyes.

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( )不得用作路基填料。

英译汉：“Customs Entry”，正确的翻译为( )。

在教师职业的()，学校对教师的需求开始从量的满足向质的提高方面转化。

明金之间的()打破了努尔哈赤起兵以来战无不胜的神话。

设f(x)在x=a处连续，且=2，则f(x)在x=a处

设f(x)在[0,1]上连续，f(0)=0,∫01f(x)dx=0,证明：存在ξ∈(0,1)，使得∫0ξf(x)dx=ξf(ξ).

(　　)不得用作路基填料。

英译汉：“Customs　Entry”，正确的翻译为(　　)。