Only when he read the newspaper the US President Obama would deliver a speech in Fudan Un

问题补充：

Only when he read the newspaper the US President Obama would deliver a speech in Fudan University.

A. he knew

B. he knows

C. does he know

D. did he know

答案：

A. he knew

B. he knows

C. does he know

(答案→)D. did he know

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