— I sent him the dictionary by mail this morning .
—You ____ that; he''s coming tomorrow afternoon .
A . needn''t have done B . didn''t have to C . needn''t do D . mustn''t do
— I sent him the dictionary by mail this morning .
—You ____ that; he''s coming tomorrow afternoon .
A . needn''t have done B . didn''t have to C . needn''t do D . mustn''t do
A。
表示“不必做某事但事实上已做了，”应用“needn''t +不定式的完成式”。