Câu hỏi

Charlie said, "I don’t know what Fred is doing".

A. He said that he doesn’t know what Fred is doing.

B. He said that he didn’t know what Fred is doing.

C. He said that he doesn’t know what Fred was doing.

D. He said that he didn’t know what Fred was doing.

Đáp án
D. He said that he didn’t know what Fred was doing.

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