Mary has got a full mark in the test. She ______ very hard all these days.A、wil

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问题 Mary has got a full mark in the test. She ______ very hard all these days.

选项 A、will work
B、may work
C、must have worked
D、could have worked

答案 C

解析本题考查的是情态动词的用法。will用于一般将来时，表示“将要……”，不合题意。 may表示“可能，也许”，如：It may rain today．(今天可能下雨。)表示推测时，may的语气较轻，不合题意。C选项must have done结构表示“一定做过……”，是对过去发生的事情最肯定的推测，如： The ground is wet．It must have rained last night．D选项中的could have done结构也表示推测，但语气比must have done轻，语气显得不太肯定，所以此题选择C。

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Mary has got a full mark in the test. She ______ very hard all these days.A、wil

Youcannotcancelyourorder________youchangeyourmindwithinthreedays.A、as

Maryhasgotafullmarkinthetest.She______veryhardallthesedays.A、wil

Theweatherreportsaysthattherewillbeastorm______twodays.A、untilB、bef

Maryhasgotafullmarkinthetest.She______veryhardallthesedays.A、will

Jack’sfathersuggestedthatJack______inLondonforafewmoredays.A、woulds

After______forthejob,you’llberequiredtowaitforthreedays.A、interviewi

Workershadtoworkunderterrible______inthepreliberationdays.A、situation

Heatesomuch______hehadn’thadamealfordays.A、evenifB、asifC、eventho

EarnYourParent’sTrust1.【T1】______ofprivilegesthatyouwant

Afterretiringfrom30yearsofteaching,EthbellPeppercouldeasilyhaved

WhatdoesNewAmsterdamreferto?[br][originaltext]Formostofitslife

[originaltext]M:Weren’tyougoingtoconfirmyourbookingatthehotel?W:You

[originaltext]Howmuchlivingspacedoesapersonneed?Whathappenswhenh

A.0.453 B.1 C.0.54 D.0.263

A（X，Y）~N（0，0，1，1，0），X~N（0，1），Y~N（0，1），E（X2+Y2）=E（X2）+E（Y2），E（X2）=D（X）+（E（X））2。

以下有关肠结核溃疡的描述，正确的是：（）A.长径与肠轴垂直 B.长径与肠轴

下图是“一带一路”示意图，读图完成下题。 世界上大都市带地域空间组

（2014年真题）砌筑砂浆用砂宜优先选用（）。A.特细砂 B.细砂

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