来自福平的问题
【Itwas,ishouldsay,verykindofyoutocomeallthewaytohelpthem,butyou___a.didn'thavetob.wouldn'thavedonec.mustn'thavedoned.mightn'thavedonei'dratheryoudidsomehouseworkwhenyouarefree,butyou_____.a.didn'tb.shouldn'tc.weren't】
Itwas,ishouldsay,verykindofyoutocomeallthewaytohelpthem,butyou___
a.didn'thaveto
b.wouldn'thavedone
c.mustn'thavedone
d.mightn'thavedone
i'dratheryoudidsomehouseworkwhenyouarefree,butyou_____.
a.didn't
b.shouldn't
c.weren't
d.don't
为什么选D不选A?
