从每小题A、B、C、D四个选项中,选出一个能填入句中空白处的最佳答案。
( )16.Jackie Chan is________ great actor.I really like his movies.
A.a B.an C.the D./
( )17.Lucy and Lily __________ sisters.They study in the same school.
A.be B. is C.am D.are