i( )buy a new watch...

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i( )buy a new watch...
I ( ) buy a new watch
A:don't need B:don't need to C:need't to

选b:don't need to=need't
所以a c 不对
“need”双重角色的用法及其区别
“need”既可以作情态动词,也可以作实义动词,但是它们的用法不同.
作为情态动词的“need”的用法与其他情态动词“can”,“may”,“must”的用法基本相同：在限定动词词组中总是位居第一,没有非限定形式,即没有不定式、-ing分词或-ed分词等形式；第三人称单数现在时没有词形变化；情态动词之间是相互排斥的,即在一个限定动词词组中只能有一个情态动词.下面是“need”作为情态动词的用法：
一、need表示“需要”或“必须”,通常用于否定句和疑问句.例如：
1．You needn't do it again．你不需要再做了.
2．He needn't worry about it．这件事他无需担心.
3．Need he do this homework first?他需要先做这些作业吗?
4．Need they fill in the form?他们需要填表吗?
二、在否定句中,可以用need的否定形式＋不定式完成体.例如：
1．We needn't have worried．其实我们不必要慌.
2．You needn't have mentioned it．你本来不必提起这件事.
3．You needn't have said that when he asked．当他问的时候,你其实不必要说.

i( )buy a new watch... I helped Sally buy a new watch I HELPED SALLY BUY A NEW WATCH是什么时态 I helped Sally ___(buy)a new watch. I’ll buy my daughter a new watch. I"ll buy my daughter a new watch.My daughter_ _ _ a new watc I would like to buy a new watch.（改为否定句） I ____ ____ to buy a "I buy a watch last year"means 连词组句buy/a/let's/watch/new/! My father ( )buy a new watch ( )my brithday 关于need 的问题I don’t think he（） a new watch. A need to buy B ne I helped Bob_(买)a new watch.