--Who sings best in your class?--Mary___________A.did B.doesC.willD.has

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--Whosingsbestinyourclass?--Mary___________A.didB.doesC.willD.has--Whosingsbestinyourclass?--Mary___

--Who sings best in your class?--Mary___________A.did B.doesC.willD.has
--Who sings best in your class?--Mary___________
A.did
B.does
C.will
D.has

--Who sings best in your class?--Mary___________A.did B.doesC.willD.has
选B啊
在这里does是助动词,它可以代替实义动词做简短回答,或做省略句.