问题描述：
解释一下括号内的动词形式,
1.The plan is so designed that noce（having begun)everyone should stick to it
2.The twins are different in appearance but(not)in characteristics
为什么是not?
3.Tom must have been playing football,and Mary(/)doing her homework
不填,不懂
4.The docter offered my father the advice that he (not smoke)so much
我觉得应该加个to
感激不尽!
1.The plan is so designed that noce（having begun)everyone should stick to it
2.The twins are different in appearance but(not)in characteristics
为什么是not?
3.Tom must have been playing football,and Mary(/)doing her homework
不填,不懂
4.The docter offered my father the advice that he (not smoke)so much
我觉得应该加个to
感激不尽!
问题解答：
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