问题补充：
Helen it if she doesn’t want to.
A. doesn’t need do
B. need not to do
C. needs not to do
D. need not do
答案：
A. doesn’t need do
B. need not to do
C. needs not to do
(答案→)D. need not do
解析：考查动词need 的用法，need 可作实义动词，它的否定形式借助于助动词do，need 也可作情态动词，它的否定形式直接加not,后跟动词原形。从四个选项中可知D正确。
