有个句子是：I think it advisable to wait.为什么不是I think it is advisa

有个句子是：I think it advisable to wait.为什么不是I think it is advisa I don't think it advisable that为什么不加is I think it good to study with a group为什么是it不是it is?to study 为什么有的时候是I think 有的时候是I think it is difficult to do sth i don't think it advisable that Tim be assigned to the job s 急问!I don not think it advisable that Tim _ to the job since i don't think it advisable that him __ to the job since he h I don't think it advisable that Peter——to the job since he h 改错 I don't think it advisable that he will be assigned to th I don’t think it advisable that Tom _A____ to the job since I don't think it advisable that Tom be assigned to the job s I don’t think it advisable that Tim _______ to the job since