—Hey Tom you are wanted on telephone.—Who is calling?—Mr. Green. I don’t know who he is

问题补充：

—Hey, Tom, you are wanted on telephone.

—Who is calling?

—Mr. Green. I don’t know who he is.

A. /; A

B. the; /

C. the; A

D. /; /

答案：

A. /; A

B. the; /

(答案→)C. the; A

D. /; /

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