英语.--Professor White has published a fifth book about clonin

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英语.
--Professor White has published a fifth book about cloning.
--Do you know when he (空) writing it?
A.has finished B.had finished C.finished D.finishs
为什么选C?我觉得应该用完成时

第一句话就表明,书已经出版了.
第二句话表示“什么时候完成的”,“完成”这个动作应该发生在出版前,强调过去.
现在完成时,表示过去的某件事持续到现在,或是对现在产生了影响.
句中没有体现到某时刻为止,而且书是已经出版了的.

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