问题
选择题
— 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
答案
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”。