TheShenzhouwouldn’thavebeensentup

发布时间：2020-07-26 20:27:44

The Shenzhou wouldn’t have been sent up successfully _________ for the great efforts of many scientists．A.if it were notB.were it notC.had it not beenD.it had not been

网友回答

C解析这是一个与过去事实相反的假设，在非真实的条件句中，可把if去掉，把had提到句首。
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