My nephew ______ from home for three days now, and I am beginning to worry about his safety.

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问题 My nephew ______ from home for three days now, and I am beginning to worry about his safety.

选项 A、has been missed
B、was missed
C、has been missing
D、had been missing

答案C

解析 miss一词的一ing形式和-ed形式的区别及时态一致。missing为形容词，表示“(人或物)下落不明，失踪的”；missed是过去分词形式，与be动词连用，为被动关系，表示“被错过的”。依句意，此处应取“失踪的”这一含义，排除A、B。由句中的时间状语for three days now可确定用现在完成时，因此选项C正确。

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专业英语四级

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My nephew ______ from home for three days now, and I am beginning to worry about his safety.

专业英语四级

Manyayoungpersontellsmehewantstobeawriter.Ialwaysencouragesuchpeople,butIalsoexplainthatthere’sabigdiff

Mrs.Sommersonedayfoundherselftheunexpectedpossessoroffifteendollars.Itseemedtoheraverylargeamountofmoney,a

Oneofthehobbiesweknowthecavemenhadwas______.

Aestheticthoughtofadistinctivelymodernartemergedduringthe18thcentury.Thewesternphilosophersandcriticsofthist

Womendriversaremorelikelytobeinvolvedinanaccident,accordingtoscientists.Researchers(1)______6.5millioncarc

Somestudentstakepartinschoolactivitiesactively,whileothersshowlittleinterestinthem.What’syouropiniononthisph

AlthoughJimishappywithhissuccesshewonders______willhappentohisprivatelife.

Asurveywascarriedoutonthedeathrateofnewbornbabiesinthatregion,______weresurprising.

Biologically,thereisonlyonequalitywhichdistinguishesusfromanimals:theabilitytolaugh.Inauniversewhichappearst

Satellitecommunicationsaresoup-to-datethatevenwhen______inthemiddleofthePacific,businessmencancontacttheiroff

严重呕吐引起代谢性碱中毒的机是

传染病区中属于半污染区的是

下列关于呕吐与进食的表述，正确的是

某化工厂在购进生产材料时．取得供货方虚开的增值税专用发票，经税务机构核实，属于善意取得。下列的陈述，符合规定的处理方法是()。

()是回答“怎么办”的知识，它所处理的对象是个人自身的认知活动，是个体调控自己认知活动的知识。

①连残荷也消逝的无影无踪②池塘里的荷叶虽然仍然是绿油油一片③好像是一下子从夏天转入秋天④但是看来变成残荷之日也不会太远了⑤再过一两个月，池水一结冰⑥连日来，天气突然变寒对上述语句排序正确的一项是：

教育研究的定量分析中最常用的反映离散趋势的差异量数是()

有以下程序main(){intk=5：while(--k)printf("％d"，k-=3)；printf("＼n")；}执行后的输出结果是

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