题目内容：

You ()finish the homework today. you will have violin lessons tomorrow.A.need B.need to
C .both A and B
为什么选择C

优质解答

当need是情态动词时,肯定句为need do sth.,否定句为needn't do sth.
当need是行为动词时,肯定句为need to do sth.,否定句为don't need to do sth.
此题中A是情态动词,B是行为动词,两种用法都对