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题目
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You _______ see a dentist when you have a toothache. 
A.mayB.needC.shouldD.can

答案
C
解析
情态动词辨析。 may    可以;need  需要;should 应该;can可能,能。句意:当你牙疼时,你应该去看牙医。故选C。
核心考点
试题【You _______ see a dentist when you have a toothache. A.mayB.needC.shouldD.can】;主要考察你对词法等知识点的理解。[详细]
举一反三
---Must I do the work today? 
---No, you _______. You may do it tomorrow.
A.can’tB.mustn’tC.shouldn’tD.needn’t

题型:不详难度:| 查看答案
–Look at that girl! Is it Susan?
--No, it _______ be her. She has gone back to her hometown.
A.mustn’tB.can’tC.needn’tD.wouldn’t

题型:不详难度:| 查看答案
The red bike _______be Hu’s. She has a blue bike.
A.mustB.mightC.canD.can’t

题型:不详难度:| 查看答案
Trees ____ fight air pollution.They are natural air conditioners.
A.shouldB.mustC.needD.can

题型:不详难度:| 查看答案
— Wow! You look different! You            wear glasses.
— Yes, I did. But now I am wearing contact lenses(隐形眼镜).
A.couldB.mustC.used toD.would

题型:不详难度:| 查看答案
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