Our teacher is always the first ___ and the last ___ in our schoolA.come ,to leave B.to come,to leave c.coming,leaving D.come,leave为什么选B?

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Ourteacherisalwaysthefirst___andthelast___inourschoolA.come,toleaveB.tocome,toleavec.coming,leavingD

Our teacher is always the first ___ and the last ___ in our schoolA.come ,to leave B.to come,to leave c.coming,leaving D.come,leave为什么选B?
Our teacher is always the first ___ and the last ___ in our school
A.come ,to leave B.to come,to leave c.coming,leaving D.come,leave
为什么选B?

Our teacher is always the first ___ and the last ___ in our schoolA.come ,to leave B.to come,to leave c.coming,leaving D.come,leave为什么选B?
be动词后面不能直接跟动词原形.第二个空的to也不可以省略.to do表示一种经常,频繁的状态.