问题
选择题
| Only when he read the newspaper _____ the US President Obama would deliver a speech in his university. |
A. he knew B. he had known C. had he known D. did he know |
答案
答案：D
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| Only when he read the newspaper _____ the US President Obama would deliver a speech in his university. |
A. he knew B. he had known C. had he known D. did he know |
答案：D