问题描述：
Tom is a lazy bone,he is always the last _______and the first_______..
Tom is a lazy bone,he is always the last _______and the first_______.
A.to come,to leave B.come,leave C.coming,leaving D.to come,leaving
why?
Tom is a lazy bone,he is always the last _______and the first_______.
A.to come,to leave B.come,leave C.coming,leaving D.to come,leaving
why?
问题解答：
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