i failed in the physics test ,you——harder before the testA could study B may study C had studied D should have studied

i have failed again in the maths he failed in the examination , 改变句型 句意不变1.The runner failed to keep up with the others though he tried his best.The runner( )( )the others though he tried his best.2.I do not think chemistry is as interesting as physics.I think chemistry is ( ) interesting ( ) phys 英语翻译Because I was not hardworking enough,I failed in the exam. I failed in the find exam last termand only then_--- the importance of studies I feel sad because I failed the I think I failed the french paper. I‘m sorry to hear that you failed in the exam My best friend Alex failed in the math competition.I'd like to [ ]. He failed in the examination.翻译下 I failed the math test怎么读 i failed the exam 同义句改写 I failed in the exam again,and the d____ look on my father's face made me even more upset. Thank you for giving me a hand. I ______ in the experiment without your valuable help.A. have failed B. will fail C. would have failed D. must have failed ---- Mary,how did your Math test go ---- I had thought I ______,but in fact I came in the top 10A.should have failed B.could have failed C.might have failed D.need have failed为什么选c 不选b i am surprise that he ( ) in the exam,为什么不用should fail 而用 should have failed my best friend Alex failed in the math competition,I wold like to 选cheer him up; take him up She failed in the exam.与She failed the exam.有什么区别?