ProfessorJohnsonissaid_____somesignificantadvanceinhisresearchinthepastyears.
C
暂无解析
Even if his letter____tomorrow ， it____too late to do anything.
_____ your timely advice,I would never have known how to go about the work.
U.S.News____________rankingsofcollegessince1983.Theyareaverypopularresourceforstudentslookingtoapplytouniversitycampus.
_____ regular training in nursing, she could hardly cope with the work at first.