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 题目和参考答案——青夏教育精英家教网—

题目内容

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

解析:

略

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