--- Shall I tell John about it?
--- No, you . I’ve told him already.
A. mustn’t
B. wouldn’t
C. shouldn’t
D. don’t have to
网友回答
A. mustn’t
B. wouldn’t
C. shouldn’t
(答案→)D. don’t have to
解析：考查情态动词用法。A禁止，不允许；B不会；C不应该；D不必。句意：—要我告诉约翰这件事情吗？—不，你不必了，我已经告诉他了。