Question

请问为什么选A Tom is very tired ,He needs ( ) a good sleep. A : to have B : have

Answer 1

need可作实义动词或情态动词
当它做情态动词时，用法与can，could，will等词的用法相同，则原句就为
He need have a good sleep.
而原句中的need后加了s，为单三形式，说明它是作为实义动词使用的，和一般动词的用法一样
则为He needs to have a good sleep.
中间加to是为了连接两个动词

Answer 2

need 是动词，固定的句型是need to do something或者need doing sth。都翻译为，需要做某事，所以选A