问题补充:
单选题Theachievementsofthegreatestmindsinsciencecouldneverhavebeenreached________thepatientworkofhundredsofothers.A.were it not forB.had it not been becauseC.had it not been forD.if it had not been
答案:
C
如果觉得《单选题The achievements of the&n》对你有帮助,请点赞、收藏,并留下你的观点哦!