if you have learned it well ,you ______ do these exercises

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if you have learned it well ,you ______ do these exercises
if you have learned it well,you ____ do these exercises.
A.don't need B.needn't to C.don't have D.don't have to

选D
首先NEED可以做实义动词,有动词词组need to do ,其否定形式为don't neeed to do译为：需要做什么；
need 也可作助动词（诸如will,can.),所以又可加动词原形,即need do,也是“需要做什么”的意思
第一项：need作实义动词,所以该改为don't need to,
第二项：need 作助动词,故应改为needn't
第三,四项区别have do（叫某人做什么）和have to do（不得不做什么）的意思
若选D,则该句意为：如果你已经把它学好了,那么你就没有必要再做这些练习了.
加油咯!

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