Tom,what are you doing?You ___ the incoming math exam.If you fail,you won't go unpunished.A.are supposed to prepare forB.are supposed to be preparing for答案说选A,为什么不能选B?我觉得可以表示“你理应正在准备考试”.

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Tom,whatareyoudoing?You___theincomingmathexam.Ifyoufail,youwon''tgounpunished.A.aresupposedtopreparef

Tom,what are you doing?You ___ the incoming math exam.If you fail,you won't go unpunished.A.are supposed to prepare forB.are supposed to be preparing for答案说选A,为什么不能选B?我觉得可以表示“你理应正在准备考试”.
Tom,what are you doing?You ___ the incoming math exam.If you fail,you won't go unpunished.
A.are supposed to prepare for
B.are supposed to be preparing for
答案说选A,为什么不能选B?
我觉得可以表示“你理应正在准备考试”.

Tom,what are you doing?You ___ the incoming math exam.If you fail,you won't go unpunished.A.are supposed to prepare forB.are supposed to be preparing for答案说选A,为什么不能选B?我觉得可以表示“你理应正在准备考试”.
这是劝告, 指说话以后对方该如何做
如果象你这样理解就带责备意味了. 要说：
You are supposed to have been preparing.
类似于should + have + been doing “本应该在做.” 事实上没在做

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