—What time will Mr. Green be back to China?—Sorry. I don't know ________.

题型：单选题题类：模拟题难易度：普通

—What time will Mr. Green be back to China?
—Sorry. I don't know ________.

A、when did he go broad B、why he is going abroad C、how soon will he be back D、how long he will stay abroad

举一反三

— In the 6th century.

——I can't decide now. I really don't know ________.

—He is an actor. He is the team leader in the popular reality TV show Running Man now.

—Well, it is fun and teaches us a lot of knowledge.

—Yes, Some news about black holes.

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