You ___worry about your lessons. I'lll try my best to help y

題目：

You ___worry about your lessons. I'lll try my best to help you.
A.need't to B don't need C don't need to D.not need to

解答：

C
再問： 爲什麼呢
再答： need 做情態動詞時 ，後面直接加動詞原形；而做實意動詞時 用to do 結構。