—Who sings best in your class? —Mary . A. is B. does C. do D. sing

问题补充：

—Who sings best in your class?

—Mary .

A. is

B. does

C. do

D. sing

答案：

A. is

(答案→)B. does

C. do

D. sing

解析：可联系答.案.网客服索取。

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