C和D解释一下C为什么不行——Mum,would you buy me a MP5 player?——If you can help do the dishes the whole vacation ,you_____have one as reward.A.must B.need C.would D.shall

C和D解释一下C为什么不行——Mum,would you buy me a MP5 player?——If you can help do the dishes the whole vacation ,you_____have one as reward.A.must B.need C.would D.shall ( )47.— It's time to go to bed,Jim.—OK.,Mum.(B) See you (C) Good evening （D）good night答案为什么选D?B不行么? You 'd better have your computer____A repair Brepaired c repairing Dto have been repaired解释一下为什么别的选项不行 为什么选c d怎么不行 C D解释一下 为什么C图不行? C为什么不行? 选C为什么不行? —Do the dishes,Mike,or I will tell mum!—Mind your own ,Sue!A.action B.duty C.business D.way为什么? 能被消化道吸收,又能向消化道分泌的营养物质（） A.水 B.维生素 C.糖类 D.纤维素解释一下另外三个为什么不行 Not until I came home last night ____ to bedNot until I came home last night ( )to bed.A.Mum did go B.did Mum go C.went Mum D.Mum went为什么不能选C... -----Do you know where Bob is?-----He has won a holiday for two people to New York.He _____ his mum.A.is taking B.have taken C.take D.takes为什么选A?选B有什么不行? 解释一下A和C. the problem is — Will goA.that whoB.who C.that D.whoever.为什么A不行呢, _____are going to the park.A.Mum and I B.Iand Mum C.Mum and me D.Me and Mum_____are going to the park.A.Mum and I B.Iand Mum C.Mum and me D.Me and Mum South of the lake two famous universitis.South of the lak e____ two famous universitis.A. have B.has C.are D.is为什么选C? 选D不行么?请详细解释一下. 如图,为什么C不行 —mum,will you take me to the park tomorrow?—If it____rainy.A won‘t B doesn't C isn’t D won't be提问：为什么选C而不选B,理由,