Linda feels exhausted because she _____ so many visitors today.A、has been having

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问题 Linda feels exhausted because she _____ so many visitors today.

选项 A、has been having
B、had been having
C、was having
D、had had

答案 A

解析 have／has been doing的用法是指过去的动作或状态从过去某时开始，持续到现在，可能持续下去，也可能刚刚结束，多用于可延续性动作.本题主句用的是一般现在时，所以从句也应该与现在时有关。如：Hehash’t been having much luck since he came here．(自从来到这里他就不太走运。)故A项为正确答案。

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Linda feels exhausted because she _____ so many visitors today.A、has been having

Whatisthemainideaofthepassage?[br]Theenergyissavedbecause______.A、

Therain______,thesoldierscontinuedtheirmarch.A、stoppingB、havingstopped

Havingatriparoundthecountryiscertainlygoodfortheoldcouple,butitre

Whydidtheelephantsitonthecar?Becausetheelephanttookittobehis_____

(send)______thebabytobed,themotherbegantoworkagain.Havingsent

Humanbeingsareafraidofratsmainlybecause______.[br]Thetextismainlyt

Humanbeingsareafraidofratsmainlybecause______.[br]Withgoodleaders,_

Humanbeingsareafraidofratsmainlybecause______.[br]Besidescarryingdis

Humanbeingsareafraidofratsmainlybecause______.[br]Brownratsaredange

Childrenusuallyenjoyplayinginthe(amuse)______parkbecausetherearemany

Choosethecorrectletter,A,BorC.[br][originaltext]Nowlistencarefullya

Whathavepeoplediscoveredabouthobbies?Hobbiescanbeprofitableand______.

Duringtheearlyyearsofthiscentury,wheatwasseenastheverylifeblood

某反应当反应温度从27℃升到37℃，反应速率常数增加一倍，求Ea。若该反应的ΔH

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