The reason why they changed their mind_______to us yet.

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问题 The reason why they changed their mind_______to us yet.

选项 A、has not explained
B、has not been explained
C、did not explain
D、was not explained

答案B

解析根据句中的时间状语yet(还)可知，主句应用现在完成时，强调过去所发生的动作或事情对现在的影响或产生的结果，着眼点在现在。根据句意可知，The reason和explain(解释)之间是逻辑上的动宾关系，所以应用现在完成时的被动语态，即主句谓语动词用“have/has been+过去分词”的形式；且此处应用其否定形式。故选B。

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本试题收录于：英语题库普高专升本分类

英语

普高专升本

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The reason why they changed their mind_______to us yet.

英语

普高专升本

A.Onmywayhome,Ihelpedtocatchathiefwhohadrobbedanoldmanofhiswallet.B.OnlyLijunknowshowtogetintouchwi

A.Manyuniversitiesputforwardnewreformplansaboutcollegeentranceexamination.B.WhydoesMarytreatmeasifIwereas

Inthisageofequalitysamenessbetweenthesexesisemphasizedasifdifferenceshavetomeanproblems.Well,differencescan

________fortuneandsocialstatus,shewasactuallyanordinary-lookingwoman.

ItseemsstrangethatinthepasttenyearsMikeandImightjustaswellhavebeenindifferentworlds.

Manyteachersbelievethattheresponsibilityforlearninglieswiththestudents.Ifalongreadingassignmentisgiven,teache

Noone________thebuildingwithoutthepermissionofthepolice.

Thenumberoftheinsectsis________sorapidlythatitcausesconcernofthelocalpeople.

There’sanotepinnedtothedoor________whentheshopwillopenagain.

Thepriceoffruithasincreasedrecently________thepriceofvegetableshasgonedown.

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面部疼痛突然发作，呈闪电样、刀割样剧烈疼痛，持续数秒到2分钟，痛处有灼热感，流涎，目赤流泪，苔薄黄，脉数。治疗除取主穴外，还应选取()

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关于人与人的工作关系，你认可的观点是()。

设为正定矩阵，其中A，B分别为m阶，n阶对称矩阵，C为m×n矩阵。利用的结果判断矩阵B一CTA一1C是否为正定矩阵，并证明结论。

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