Our teacher is always the first ___ and the last ___ in our

題目：

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
爲什麼選B?

解答：

e動詞後面不能直接跟動詞原形.第二個空的to也不可以省略.to do表示一種經常,頻繁的狀態.