If Tom have studied harder before,he____(pass)the examination last week.是would pass么?还是别的?

If Tom have studied harder before,he____(pass)the examination last week.是would pass么?还是别的? --I failed in the exam.--sorry to hear that,if only you__with greater care.A.had studied B.studied C.have studied D.study should have studied I would have been smarter,if I had studied more.I would be smarter,If I studied more.有什么区别?（时态区别） 阅读表达If you have studied a foreign language,you must know how difficult have studied 和 have been studied的区别 If I ____ english hard,I would pass the final exam.A.studiedB.studyC.am studyingD.have studied Tom is said____abroad,but I'm not sure what country he studied in.A.to have studiedB.to study C.to be studyingD.to have been studying 谢if you had taken your medicine yesterday,you ____ well now.a would have beenb should be c woule be d will beif you ____ harder,you ____ tomorrow'exam.a studied ; will passb studied; would have passedc had studied; would passd had studied; woule ha Tom and Tim have studied at our school for about forty days_______.A.of all B.in all C.after all D.at all _____you have studied the rules,you shouldn't have made that mistake.A.Whether B.Whatever C.Even if D.Although为什么呢 You have failed in the test again .You ( ) hard at your subject .A should have studied B must have studied C may have studied D need have studied 1.I wouldn't have become an accountant now if I ____so hard when I was at the tutorial centre.A.didn't study B.hadn't studied C.wouldn't have studied D.didn't have studied我选了C,如果我没有在辅导中心努力学习我就不可能成为一 studied studied if i studied harder和 if i had studied harder 语义上有何差别 请翻译一下：do you have studied? Have you (ever)studied (with)a group?