TOM is not having been trained as a dancer is her own regret.这里为什么要用having been done呢,直接用done 可以吗?

TOM is not having been trained as a dancer is her own regret.这里为什么要用having been done呢,直接用done 可以吗? Now Tom is having his English tom is not () home today? The boy ___(not be) Tom.还有He would like ___(is) a teacher. Why not tell me the truth,Tom?You know how terrible it is to be d___. _____ hard before, Tom is afraid of failing in the exam. A. Having been worked B. Not to have worked C. Having never worked D. Never have worked为什么选C而不可以用Never having worked Tom and Kate here_____.(not be) Tom and Kate ______(not be) here. Tom and Kate __________(not be) here Tom with his classmate is having an english lesson now 这里为什么用　is having? Tom is not healthy .(同义句)Tom is not healthy .(同义句)Tom _________ ___________. Tom is believed _____ handsome when he was in college.A.to be B.to have been C.having been D.being This book ___ Lucy's.Tom's name is on its cover.A.can't be B.mustn't be C.may not be选啥,还有一个辨析的may be not 与may not be 有区别吗 tom is not ( )home.(介词填空 Is Tom happy or not?回答 Which is not true about Tom? Tom does not know this as I dao .But I will not do it ,It would be wrong ,and I will not do what is wrong Tom is a little fatter boy than he wants to be,he tries not to eat too much翻译