I don't manage to do it__you had explained how.选项A.until B.unless.C.when D.before答案是A．为什么B 不行?

I don't manage to do it__you had explained how.选项A.until B.unless.C.when D.before答案是A．为什么B 不行? i don't know how you all manage to survive on Jeremy's salary i didn't manage to do it_____you had explanied howAuntil Bunless Cwhen Dif i didn't manage to do it_____you had explanied howAuntil Bunless Cwhen Dif i don't know what to do I don't want to do anything 请问I don't mean to do Don't stop to wait for me.I can manage to ____ youA:overtake B:overturn C:overlook D:oversee manage to do sht i don't know how to do it句型转换i don't know[ ][ ][ ]do. Tom____any help,he can manage to do it.A,needn't B.don't need C.not need D.doesn't need I understand,but,I don't know what to do? i didn't manage to do it 空格 you had explained it now ; a:until; b:when ; c : I don't know want to do...tell me? because I don't have enough times to do them. I really don't konw how to do about it I don’t want to,do this any longer 翻译I don't know what to say or do.