高三英文单选..1.Itwasverykindofyoutocleantheroom,butyou___it.正解C.didn'thavetodoA.needn'tdo为什么不行?2.翻译这句话.Doingyourhpmewoakisasurewaytoimproveyourtestscoresandthisisespeciallyturewhenitcom

　　高三英文单选..

　　1.Itwasverykindofyoutocleantheroom,butyou___it.

　　正解C.didn'thavetodoA.needn'tdo为什么不行?

　　2.翻译这句话.Doingyourhpmewoakisasurewaytoimproveyourtestscoresandthisisespeciallyturewhenitcomestoclassroomrules.

　　3.-Doyouthink___Ishouldenterforthecompetition?

　　-Yes,it'sagoodchance.

　　正解是that应该理解成宾语从句是吧?可使用if也挺顺的啊..不用if用whether可以吗?

　　4.-Whatdoyouthinkoftheplan?

　　-_____Iaccepttheplanisnotperfect,Idoactuallylikeit.

　　为什么since不行而用while.while在这里翻译成什么意思?